nproc: Reject quota with some schedulers

[oech3]

Closes #9893 .
Difficult to add test. Also needs another fix to pass GNU tests.

[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/tail/symlink (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/tail/follow-name (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/tty/tty-eof (passes in this run but fails in the 'main' branch)
Congrats! The gnu test tests/rm/isatty is no longer failing!
Note: The gnu test tests/nproc/nproc-quota was skipped on 'main' but is now failing.

[oech3]

Note: The gnu test tests/nproc/nproc-quota was skipped on 'main' but is now failing.

libc function was detected.

[github-actions]

GNU testsuite comparison:

Note: The gnu test tests/nproc/nproc-quota was skipped on 'main' but is now failing.

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/tail/retry. tests/tail/retry is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/date/date-locale-hour (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/pr/bounded-memory (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/nproc/nproc-quota was skipped on 'main' but is now failing.

[github-actions]

GNU testsuite comparison:

Note: The gnu test tests/nproc/nproc-quota was skipped on 'main' but is now failing.

[codspeed-hq]

Merging this PR will not alter performance

✅ 319 untouched benchmarks
⏩ 46 skipped benchmarks¹

---

_{Comparing oech3:nproc-s (e7b9033) with main (29fdaa6)}

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. ↩

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/date/date-locale-hour (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/cut/bounded-memory (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/date/resolution (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/dd/no-allocate is now being skipped but was previously passing.
Note: The gnu test tests/seq/seq-epipe is now being skipped but was previously passing.
Note: The gnu test tests/nproc/nproc-quota was skipped on 'main' but is now failing.

[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/date/resolution (fails in this run but passes in the 'main' branch)
Note: The gnu test tests/cut/bounded-memory is now being skipped but was previously passing.
Congrats! The gnu test tests/rm/many-dir-entries-vs-OOM is now passing!
Congrats! The gnu test tests/tail/pipe-f is now passing!
Note: The gnu test tests/nproc/nproc-quota was skipped on 'main' but is now failing.

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/pr/bounded-memory (fails in this run but passes in the 'main' branch)
Congrats! The gnu test tests/tail/pipe-f is now passing!
Note: The gnu test tests/nproc/nproc-quota was skipped on 'main' but is now failing.

[oech3]

I tried to replace unsafe libc with rustix, but failed.
I know tests/nproc/nproc-quota needs LD_PRELOAD, but which tests same things with nproc-quota-masked-proc (submitted by me).

[oech3]

is this OK?

[oech3]

@cakebaker @sylvestre Is this OK to merge?

[oech3]

@sylvestre Would you merge this?

[sylvestre]

sorry
can we get an android specific test for this?

[oech3]

I think it is difficult due to sudo dep.

[oech3]

But we should catch regression when tests/nproc/nproc-quota was disabled.

[oech3]

Fixing #9815 should enable a GnuTest to avoid regression of this. But I cannot do that soon. I don't know any reasonable way to get quota.