Allow users to override Bazel's 120s connect timeout

Bazel constrains starting up and connecting to a local server to 120s.  This
occasionally causes problems for us on heavily loaded, high numcpu machines,
because the Bazel client+server may end up starved out via simple CPU
contention.  (Where we observed startup timeouts, machines had plenty of RAM,
I/O looked normal---procs weren't stuck in disk wait---but the run queues were
60+.)

Mitigate this by introducing a new startup option, `--local_startup_timeout_secs`,
which allows users to specify their own timeout values.  (Note:  I primarily
used `connect_timeout_secs` as a reference.)

TODO: Consult Bazel team to add test case per comments in
[bazel_startup_options_test.cc].

Resolves [#8988].

[bazel_startup_options_test.cc]: https://github.com/bazelbuild/bazel/blob/8075057af6108ebc23c146f18eecec911d4b8c00/src/test/cpp/bazel_startup_options_test.cc#L79-L81
[#8988]: https://github.com/bazelbuild/bazel/issues/8988

Testing Done:
- Induced high load on my MBP, then
```console
$ vbazel --local_startup_timeout_secs=1 info release
Starting local Bazel server and connecting to it...
FATAL: couldn't connect to server (16290) after 1 seconds.
```

Closes #11391.

PiperOrigin-RevId: 338729701
6 files changed
tree: ef82f580bd30ae727856b7aa329553725586256d
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEBASE.md
  15. CODEOWNERS
  16. combine_distfiles.py
  17. combine_distfiles_to_tar.sh
  18. compile.sh
  19. CONTRIBUTING.md
  20. CONTRIBUTORS
  21. distdir.bzl
  22. ISSUE_TEMPLATE.md
  23. LICENSE
  24. README.md
  25. WORKSPACE
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