Remove noisy warning recommending --test_verbose_timeout_warnings

[keith]

This warning seems to appear on almost every project I test things on,
implying that it's not very useful at driving any action, at the same
time it's noise that makes non-bazel-experts wonder if they're doing
something wrong, especially when they're adding a new test target.

Alternatively we could add yet another flag to disable this, but it
seems like it is fine to allow this flag to be one that is discovered
and passed manually when there is an issue.

[gemini-code-assist]

Code Review

This pull request removes the noisy warning that recommends using --test_verbose_timeout_warnings. The changes correctly remove the logic for displaying this warning by deleting the wasUnreportedWrongSize flag and its related handling across several files, including TerminalTestResultNotifier, TestResultAggregator, and TestSummary. The implementation preserves the existing behavior for verbose warnings when the flag is explicitly used. The related documentation and tests have also been updated accordingly. The changes are clean and effectively address the issue of excessive noise in test outputs.

[gregestren]

That's some old code: 2010.. cl/15839396, cl/13194819, and b/2623366 have some history (Google-only). That includes removing the warning then re-enabling it. We should check if the rationale then makes any sense now