Undoes https://github.com/grpc/grpc/pull/27096.
While we lost context why py tests were used pinned cpp server,
we think this is due to lack of support of the set_not_serving RPC
in the python server, see https://github.com/grpc/grpc/issues/30635.

This RPC is only used in two tests, and for them we added a
temporary override of the test server to the reference Java server,
see https://github.com/grpc/grpc/pull/30636.

All other LB tests should work with the python server just fine.

* bump version to 1.48.1-pre1

* regenerate projects

This fixes fork-related process hangs due to threads not being properly shutdown.

* don't expose vector type

* don't down-cast from inside base class ctor

* bump version to 1.48.0

* regenerate projects

* bump version to 1.48.0-pre1

* regenerate projects

* bump C-core version

* regenerate projects

* Bump version to 1.47.0-pre1 (on v1.47.x branch) (#29830)

* bump version to 1.47.0-pre1

* regenerate projects

* xDS: Workaround to get gRPC clients working with istio (#29841) (#29850)

* xDS: Workaround to get gRPC clients working with istio

* Formatting

* Comment test too

* Disable instead of commenting

* Support for prebuilt Ruby binary on x64-mingw-ucrt platform (#29684) (#29868)

* Add support for prebuilt Ruby binary on x64-mingw-ucrt platform, which is used for Windows RubyInstaller Ruby 3.1+

Co-authored-by: Johnny Shields <johnny.shields@gmail.com>

* use constraints value in @platforms instead of @bazel_tools//platforms https://github.com/bazelbuild/bazel/issues/8622

 (#30019)

* Set Correct Platform Tag in Wheels on Mac OS with Python 3.10 (#29857) (#30026)

* Attempt to set correct platform on Mac OS

* Add some debug

* Make it fail

* Print more

* Try again

* Maybe it's an ordering issue?

* Get logs back

* Try copying distutils to see exactly what is being used

* Actually export the variable

* I just love debugging with CI

* One directory higher this time

* Try with an upgraded Python install

* Fix version

* Rebreak

* Try setting it even earlier?

* Unbreak

* Try explicitly renaming the artifacts

* Fix

* I am about ready to start NAT hole punching for SSH

* Break things for logs

* Whoops

* Clean up

* Shellcheck

* xds-k8s jobs: standardize TESTING_VERSION (#30027) (#30048)

This Addresses the issue with skips not working in golang tests, ref b/235688697. 

1. Unifies `TESTING_VERSION` detection  in grpc_xds_k8s_install_test_driver.sh - new approach applicable to all languages.
2. Use `TESTING_VERSION` in all build files in `--testing_version` and when tagging docker images. This will be backported to all active test branches. Build Scripts in all other languages will be updated as well.

* Bump Release Version to 1.47.0 (#30073)

* bump version to 1.47.0

* regenerate projects

* Using string rep for status-time (#30123) (#30145)

* tell MSVC to build grpc with utf-8 (#30003) (#30153)

* tell MSVC to build grpc with utf-8

fix #29979

* generate_projects

Co-authored-by: AJ Heller <hork@google.com>

Co-authored-by: AJ Heller <hork@google.com>

Co-authored-by: Richard Belleville <rbellevi@google.com>
Co-authored-by: apolcyn <apolcyn@google.com>
Co-authored-by: Johnny Shields <johnny.shields@gmail.com>
Co-authored-by: Ara Nguyen <91614797+aranguyen@users.noreply.github.com>
Co-authored-by: Sergii Tkachenko <sergiitk@google.com>
Co-authored-by: Esun Kim <veblush@google.com>
Co-authored-by: hongnod <6680267+hongnod@users.noreply.github.com>
Co-authored-by: AJ Heller <hork@google.com>

* XdsSecurityTest: Rework infrastructure

* Reviewer comments

* Comment

* Add TODO

* Upgrade abseil to 20220623.0

* Fix subchannel include

Change secure endpoint write code to use max_frame_size to control encrypted frame sizes at the sender. (#29990)

* use max_frame_size to control encrypted frame sizes on the sender

* Add comment

* adding logic to set max_frame_size in chttp2 transport and protecting it under a flag

* fix typo

* fix review comments

* set max frame size usage in endpoint_tests

* update endpoint_tests

* adding an interception layer to secure_endpoint_test

* add comments

* reverting some mistaken changes

* Automated change: Fix sanity tests

* try increasing deadline to check if msan passes

* Automated change: Fix sanity tests

Co-authored-by: Vignesh2208 <Vignesh2208@users.noreply.github.com>

* C++ end2end tests: refactor ConnectionAttemptInjector code

* clang-format

* use max_frame_size to control encrypted frame sizes on the sender

* Add a flag to control usage of min_progress_size in TCP for receive buffer allocation

* revert changes to secure_endpoint and move them over to another PR

* add min_progress_size to tcp_posix_test

* update tcp_posix_test to assert fail on min_progerss_size and fix bug in min_progress_size handling in tcp_posix.cc

* fix corner case

* add a static cast

* Update authz core tests to use callback

This reverts commit da0eb19b.

* Update maintainers

* Update by review

* Revert "[chttp2] Use Closure::Run to invoke callbacks (#29844)"

This reverts commit e7b1ad09

.

* Update chttp2_transport.cc

* Automated change: Fix sanity tests (#30144)

Co-authored-by: ctiller <ctiller@users.noreply.github.com>

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: ctiller <ctiller@users.noreply.github.com>

* [activity] Fix use after exit bug in Waker

* rewrite to not use static data

* Remove dead code

* More dead code

* Automated change: Fix sanity tests

Co-authored-by: ctiller <ctiller@users.noreply.github.com>

* Save ENOBUFS errno correctly in tcp_posix for subsequent handling

* remove log statement

* Tryonly running fetch_build_eggs once

* Run pip freeze

* Use the correct pip

* Try explicitly printing stacktrace

* Try to pin/upgrade the wheel package

* Try running only 3.8

* Show the initial state of the egg directory

* Whoops

* More permissive

* What does this button do?

* Try just 3.9

* Try 3.10

* Back to 3.8

* Try pre-installing protobuf

* Clean up

* Clean up better

* update win RBE docker image and toolchain

and switch win RBE builds to using it.

* delete legacy RBE windows toolchain config

* switching to VS2019 makes #28544 obsolete

* replace darwin checks in extconf.rb to exclude TruffleRuby

* inherit RANLIB and STRIP from RbConfig, set LDXX

* enable overriding ranlib command in top-level makefile

* ensure the -no_warning_for_no_symbols flag is only used with Apple's ranlib

* don't embed openssl & zlib on truffleruby

* add RbConfig's cppflag to CPPFLAGS when using TruffleRuby

* this ensure the paths to find the system's OpenSSL are set up correctly with TruffleRuby (includes being able to find an OpenSSL installed via Homebrew etc)

* don't statically link standard libraries on Linux with Truffleruby

* This does not work when compiling to bitcode.

* Prefer SIGTERM to SIGQUIT for graceful shutdown in examples

* Overriding SIGQUIT is suboptimal, for example on JVM where it is very
  useful to dump the thread stacktraces.

* Keep the rb_tr_abi_version symbol for TruffleRuby in grpc_c.so

* Otherwise TruffleRuby cannot verify the ABI version is correct.
* See https://github.com/oracle/truffleruby/issues/2386



* Use RbConfig::CONFIG['STRIP'] instead of just `strip`

* Use a local variable for apple_toolchain for consistency

* Add a comment about -static-libgcc -static-libstdc++ and TruffleRuby

* Split comment into two for openssl/zlib

Co-authored-by: Nicolas Laurent <nicolas.laurent@oracle.com>

* Revert "Revert "Reland bytestream removal (#29911)" (#29964)"

This reverts commit e6c6840d

.

* initial fc fuzzer

* fixes

* add rq to fc fuzzer

* fleshing things out

* Automated change: Fix sanity tests

* cleanup

* send with payload

* ensure if no reader no flow control tokens are granted

* remove some public methods

* remove bogus benchmarks

* account for pending size

* Automated change: Fix sanity tests

* Automated change: Fix sanity tests

* better logic

* Automated change: Fix sanity tests

* fix

* fixes

* fuzz pending size

* Automated change: Fix sanity tests

* fix

* Automated change: Fix sanity tests

* huh

* increase too short timeout

* review feedback

* review feedback

* fix u32 overflow

* fix

* robustness fixes for channelz_servicer_test

* fix

* Automated change: Fix sanity tests

* fix

* fix

* fix

* Automated change: Fix sanity tests

* dont send window updates if read closed

* Automated change: Fix sanity tests

Co-authored-by: ctiller <ctiller@users.noreply.github.com>

* Add regular tests for PSM benchmarks CI

* Remove temporary EventEngine initialization function

* Automated change: Fix sanity tests

Co-authored-by: drfloob <drfloob@users.noreply.github.com>

* Fix leak on ares resolver test

The pollset was not being properly shutdown. ASAN was failing 100% on
resolve_address_using_ares_resolver_test for a month (not identified in
CI).

* DoNothgin -> nullptr

A minor refactoring.

Added a couple of tests which run the baseline_test with all released
bootstrap generator versions on client and server. These tests will be
run on a continuous integration environment with gRPC servers and
clients built using the latest released version of gRPC in one selected
language.

* Add supported Node version ranges in xDS k8s url_map tests

This adds is_supported implementations for most of the url_map tests that didn't
already have them. The exception is metadata_filter_test because it doesn't use
any specific client features.

* Fix formatting

* Improve timeout test check order