Implement a workaround for macOS/Bazel flakes. #11957
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Implement a workaround for macOS/Bazel flakes.
Bazel has a 2 minute timeout for their internal
xcrun
call, which can be exceeded on our github runners about 5% of the time. This leads to flakes and opaque errors, but is a one-time cost. Subsequent xcruns finish in seconds, so we can just do an initial call w/o a timeout before running Bazel.With this change our total flake rate drops from ~30% to nearly 0% for our full suite of tests
See bazelbuild/bazel#17437 for background.