Add a step in distribution test which checks if any of the artifacts exceeds 80 MB since Pypi has a per-file size limit.
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Closes#35831
COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/35831 from XuanWang-Amos:dist_test_add_size_check de50f20e14
PiperOrigin-RevId: 605664419
Change was created by the release automation script. See go/grpc-release.
On top of changes made by the script, `setup.py` had to be updated to have `/std:c11` option for MSVC to use c11 features for boringssl.
Closes#35768
PiperOrigin-RevId: 603403329
Fix: https://github.com/grpc/grpc/issues/35085
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Closes#35325
PiperOrigin-RevId: 592635611
Xuan Wang