chmod: modified no-op errors for parity with gnu

[max-amb]

Part of #12584, fixes chmod/only-op.sh.

[codspeed-hq]

Merging this PR will not alter performance

✅ 323 untouched benchmarks
⏩ 46 skipped benchmarks¹

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_{Comparing max-amb:chmod_no_op (f487d87) with main (eee005a)}

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:

Skipping an intermittent issue tests/tail/retry (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)
Skipping an intermittent issue tests/timeout/timeout-group (passes in this run but fails in the 'main' branch)
Congrats! The gnu test tests/chmod/only-op is no longer failing!
Congrats! The gnu test tests/basenc/bounded-memory is now passing!

[sylvestre]

should be translatable

[sylvestre]

please add a rust test