Move UmaskGuard in uucore and use it for mkdir, mkfifo & mknod

[sylvestre]

followup of #10036

[codspeed-hq]

Merging this PR will not alter performance

✅ 323 untouched benchmarks
⏩ 46 skipped benchmarks¹

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_{Comparing sylvestre:followup-10036 (df0eecc) with main (80cc829)²}

Footnotes

1. 46 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on main (47d7c76) during the generation of this report, so 80cc829 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/tty/tty-eof (passes in this run but fails in the 'main' branch)

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/shuf/shuf-reservoir (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/sort/sort-stale-thread-mem (passes in this run but fails in the 'main' branch)
Congrats! The gnu test tests/ptx/ptx-overrun is no longer failing!

[ChrisDryden]

This test is failing because the coverage tests use -Cpanic=abort so they don't have catch_unwind

You can add:

#[cfg(panic = "unwind")]

[ChrisDryden]

I think we have to be careful adding umask integration tests when its running multi-threaded because the UMaskGuard affects the process, when stress testing it the tests were flaky. Maybe adding a Mutex in the unit tests?

Might be good to add a comment in the helper function:

  /// Note: umask is process-wide, so this guard is not thread-safe.
  /// Concurrent use from multiple threads will cause race conditions.

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/shuf/shuf-reservoir (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/sort/sort-stale-thread-mem (passes in this run but fails in the 'main' branch)

[ChrisDryden]

Lgtm just has conflicts

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/date/date-locale-hour (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/misc/tty-eof (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/tail/tail-n0f (passes in this run but fails in the 'main' branch)
Congrats! The gnu test tests/seq/seq-epipe is now passing!