Fix: wait_or_timeout process wait wont have 100 ms latency

[cerdelen]

Removes sleep mentioned in #11615 for a timeouted recv on the pipe. Also removes the latency mentioned in #9099 for when the child process finishes (still needs to loop to check the Atomic bool signaled)

following is a hyprfine showing the new version vs the old version

hyperfine --runs 100 './old_timeout  0.01 echo .' './new_timeout  0.01 echo .'
Benchmark 1: ./old_timeout  0.01 echo .
  Time (mean ± σ):     119.3 ms ±   2.6 ms    [User: 5.9 ms, System: 7.1 ms]
  Range (min … max):   110.7 ms … 122.5 ms    100 runs

Benchmark 2: ./new_timeout  0.01 echo .
  Time (mean ± σ):       3.1 ms ±   1.3 ms    [User: 1.3 ms, System: 1.4 ms]
  Range (min … max):     2.7 ms …  15.4 ms    100 runs

  Warning: Command took less than 5 ms to complete. Note that the results might be inaccurate because hyperfine can not calibrate the shell startup time much more precise than this limit. You can try to use the `-N`/`--shell=none` option to disable the shell completely.
  Warning: The first benchmarking run for this command was significantly slower than the rest (15.4 ms). This could be caused by (filesystem) caches that were not filled until after the first run. You should consider using the '--warmup' option to fill those caches before the actual benchmark. Alternatively, use the '--prepare' option to clear the caches before each timing run.

Summary
  ./new_timeout  0.01 echo . ran
   38.11 ± 15.82 times faster than ./old_timeout  0.01 echo .

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/misc/yes. tests/misc/yes 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?
Skipping an intermittent issue tests/pr/bounded-memory (passes in this run but fails in the 'main' branch)

[codspeed-hq]

Merging this PR will degrade performance by 22.08%

❌ 2 regressed benchmarks
✅ 307 untouched benchmarks
⏩ 46 skipped benchmarks¹

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

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	timeout_enforced	91.1 µs	116.9 µs	-22.08%
❌	Simulation	timeout_quick_exit	197.6 µs	226 µs	-12.55%

---

_{Comparing cerdelen:wait_or_timeout_early_return (fe8d625) with main (12cdba2)}

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. ↩

[sylvestre]

a bunch of jobs are failing, sorry