* cleanup C# win artifact build
* build C# basictests on win with ninja
* specify default parallelism for C# win artifact
* honor GRPC_PYTHON_BUILD_EXT_COMPILER_JOBS in build_artifact_python.bat
* set --inner_jobs for windows grpc_build_artifact job
* fixup C# build picking env variables from C core build
* get rid of no longer needed NativeDependenciesConfiguration C# setting
* support "move and respawn" for kokoro jobs
* delete_nonartifacts.sh no longer needed
* bazel distribtest dont publish any artifacts
* try the altsrc respawn for selected jobs
* use altsrc for all windows CI jobs
* use altsrc for all macos CI jobs
* only move files under src/github
* fix uploading artifacts on windows
* Download the working msys64 and use it to compile 27
* Remove the cygwin detection override logic
* Only install Python interpreters in jobs running on winserver2016
* Fix the batch script substring check
* Increase the timeout for related jobs
* TIL that there is an allow list for Kokoro env vars
* Download the working msys64 and use it to compile 27
* Remove the cygwin detection override logic
* Only install Python interpreters in jobs running on winserver2016
* Fix the batch script substring check
* Increase the timeout for related jobs
* TIL that there is an allow list for Kokoro env vars