test failure: print stacktrace on I/O error

Print the stacktrace of unexpected I/O errors in
StandaloneTestStrategy, to ease diagnosing the
root cause of the exception.

See https://github.com/bazelbuild/bazel/issues/4924

Without the stacktrace, all we see in BuildKite
is, for example:

```
ERROR: Caught I/O exception: java.io.IOException: C:/users/b/_bazel_b/bnp8s_vg/execroot/io_bazel/_tmp/b6bda2f0385d1152d3a7f550c6cc1938/_bazel_b/install/23a47abea50baae4d7e032437c1cecc9/_embedded_binaries/embedded_tools/jdk/bin/java.exe (Permission denied)
ERROR: C:/build/buildkite-worker-windows-java8-lfl8-1/bazel/google-bazel-presubmit/src/test/py/bazel/BUILD:71:1: Couldn't build file src/test/py/bazel/bazel_windows_test/test.log:  failed: unexpected I/O exception: C:/users/b/_bazel_b/bnp8s_vg/execroot/io_bazel/_tmp/b6bda2f0385d1152d3a7f550c6cc1938/_bazel_b/install/23a47abea50baae4d7e032437c1cecc9/_embedded_binaries/embedded_tools/jdk/bin/java.exe (Permission denied)
```

The above log contains no information on what
exactly tried accessing java.exe and how, and why
it failed. With a stacktrace I'm hoping to shed
light on the culprit.

Change-Id: I4f3851cd1bc1b2b348217de5b41069591a8f4446

Closes #5207.

Change-Id: I792f4a36c1e31ca6332db2dc2d37bd8e597050b3
PiperOrigin-RevId: 196815410
1 file changed
tree: b84079a699317ebca56d64e72a724d883841c679
  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. combine_distfiles.py
  14. combine_distfiles_to_tar.sh
  15. compile.sh
  16. CONTRIBUTING.md
  17. CONTRIBUTORS
  18. ISSUE_TEMPLATE.md
  19. LICENSE
  20. README.md
  21. WORKSPACE
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