cut: improve and shorten help text

[cakebaker]

The current help output is very long and wordy. This PR is an attempt to make it much shorter.

I used the help of an AI for this PR.

[mustafaelrasheid]

I see no changes done to the french locale, even though both English and French help texts are about equally long.

[mustafaelrasheid]

Also, a lot of the length in the cut after-help output comes from new lines, which is rather an a lot easier corner to cut when it comes to length than shortening potentially valuable content.

[cakebaker]

Changes since last push:

• rebased
• removed failing test test_help_uses_plain_text_headings. I removed it as I think it is not that useful to check whether the formatting of text headings are correct

[codspeed-hq]

Merging this PR will improve performance by 3.94%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 1 improved benchmark
✅ 40 untouched benchmarks
⏩ 366 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	du_summarize_balanced_tree[(5, 4, 10)]	16.4 ms	15.8 ms	+3.94%

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing cakebaker:cut_improve_help (d9ac3be) with main (bfd7c63)}

Footnotes

1. 366 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. ↩

[mustafaelrasheid]

Isn't .stdout_does_not_contain("###"); meant to be there to prevent issues such as #13988 and #13978 from regressing?

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/cut/bounded-memory (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/tail/symlink (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/tail/pipe-f is now being skipped but was previously passing.
Congrats! The gnu test tests/cp/link-heap is now passing!
Congrats! The gnu test tests/rm/many-dir-entries-vs-OOM is now passing!
Congrats! The gnu test tests/seq/seq-epipe is now passing!

[cakebaker]

@mustafaelrasheid yes, that's the reason the test was added. However, I don't think it needs testing as it was not a bug in the code.