Windows: fix tests to work with test wrapper

Fix the shell tests to work with
--experimental_windows_native_test_wrapper (when
using Bazel built at HEAD).

In this change:

- Remove the is_windows function definition from
  testenv.sh, to ensure that tests wanting to
  check the platform will define their own
  is_windows variable (as many tests already do).

- Define the is_windows variable using `uname` in
  every test that needs to know the platform.

- Use the Bash runfiles library in the affected
  tests.

- Every test that calls "bazel shutdown" now uses
  it with try_with_timeout, so tests won't fail
  flakily when bazel cannot immediately be shut
  down.

See https://github.com/bazelbuild/bazel/issues/5508

Closes #7126.

PiperOrigin-RevId: 229539256
19 files changed
tree: 555a422f0cd4c0713e6857983fd68caac3e78a2d
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. BUILD
  12. CHANGELOG.md
  13. CODEOWNERS
  14. combine_distfiles.py
  15. combine_distfiles_to_tar.sh
  16. compile.sh
  17. CONTRIBUTING.md
  18. CONTRIBUTORS
  19. distdir.bzl
  20. ISSUE_TEMPLATE.md
  21. LICENSE
  22. README.md
  23. WORKSPACE
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