WIP Draft: Validating that mattsu2020 approach to pipes works with all pipe tests

[ChrisDryden]

Not for review just for discussion and validation of pipeline handler approach

I took the change that mattsu2020 made to be able to track the pipe signals and just did some messing around to see if that approach could work for all of the pipe related tests. Will use this for inspiration to make PR's for each one individually. I found that some of the original changes didn't work and that the other GNU tests have different expectations for how seq fails

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/fold/fold-characters. tests/fold/fold-characters is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/tail/pipe-f2. tests/tail/pipe-f2 is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/tail/retry. tests/tail/retry is passing on 'main'. Maybe you have to rebase?
Congrats! The gnu test tests/env/env-signal-handler is no longer failing!
Congrats! The gnu test tests/seq/seq-epipe is no longer failing!
Congrats! The gnu test tests/tail/follow-stdin is no longer failing!
Congrats! The gnu test tests/tail/pid-pipe is no longer failing!
Congrats! The gnu test tests/tail/pipe-f is no longer failing!
Note: The gnu test tests/printf/printf-surprise is now being skipped but was previously passing.

[codspeed-hq]

CodSpeed Performance Report

Merging #9646 will degrade performances by 2.54%

_{Comparing ChrisDryden:fix-gnu-close-stdout-tests (060fba1) with main (8ec02e7)}

Summary

❌ 2 regressions
✅ 125 untouched
⏩ 6 skipped¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	du_summarize_balanced_tree[(5, 4, 10)]	8.3 ms	8.5 ms	-2.2%
❌	cp_large_file[16]	354.1 µs	363.3 µs	-2.54%

Footnotes

1. 6 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:

GNU test failed: tests/tail/pipe-f2. tests/tail/pipe-f2 is passing on 'main'. Maybe you have to rebase?
Congrats! The gnu test tests/env/env-signal-handler is no longer failing!
Congrats! The gnu test tests/seq/seq-epipe is no longer failing!
Congrats! The gnu test tests/tail/follow-stdin is no longer failing!
Congrats! The gnu test tests/tail/pid-pipe is no longer failing!
Congrats! The gnu test tests/tail/pipe-f is no longer failing!