uniq: accept a repeated -D/--all-repeated, last one wins

[AlejandroCoronadoN]

Problem

Passing -D/--all-repeated more than once fails:

$ printf 'a\na\nb\nb\nc\n' | uniq -D --all-repeated=separate
error: the argument '--all-repeated[=<delimit-method>]' cannot be used multiple times

-D and --all-repeated are the same option, and clap rejects the repeat. GNU
uniq accepts a repeated option and uses the last occurrence, so a script that
mixes the short and long form works there but fails here.

Fix

Add .overrides_with(options::ALL_REPEATED) so a later occurrence overrides an
earlier one, matching GNU.

Verification

$ printf 'a\na\nb\nb\nc\n' | uniq -D --all-repeated=separate
a
a

b
b

Output matches GNU coreutils (guniq) exactly. Added a regression test; the
full test_uniq suite passes and cargo fmt / cargo clippy are clean.

[codspeed-hq]

Merging this PR will degrade performance by 0.1%

⚠️ 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
❌ 1 regressed benchmark
✅ 351 untouched benchmarks
⏩ 50 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	du_summarize_balanced_tree[(5, 4, 10)]	16.3 ms	16.9 ms	-3.3%
⚡	Simulation	ls_recursive_balanced_tree[(6, 4, 15)]	120.7 ms	117 ms	+3.21%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing AlejandroCoronadoN:fix-uniq-repeated-all-repeated (67e88c1) with main (d8bee62)}

Footnotes

1. 50 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]

not sure we need 3 lines comment here

please make it shorter

[AlejandroCoronadoN]

Thanks! Shortened the comment to a single line.

[github-actions]

Binary size comparison:

Individual binary size comparison VS main (threshold: >=5% AND >=4 KB).

Total size of compared binaries: 148.97 MB (-132 KB, -0.09%)

Significant per-binary changes:
  [           1.10 MB ->    1.18 MB  (+76 KB, +6.74%)
  test        1.10 MB ->    1.18 MB  (+76 KB, +6.74%)
  install     1.25 MB ->    1.32 MB  (+72 KB, +5.62%)
  mkdir       1.10 MB ->    1.17 MB  (+72 KB, +6.38%)
  mkfifo      1.09 MB ->    1.16 MB  (+72 KB, +6.45%)
  mknod       1.10 MB ->    1.17 MB  (+72 KB, +6.41%)
  chmod       1.15 MB ->    1.22 MB  (+68 KB, +5.76%)

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/date/resolution (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)
Skipping an intermittent issue tests/tail/tail-n0f (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.