refactor: use proc macro for wasi ignore reasons

[eduardomourar]

Centralizes the ~400 #[cfg_attr(wasi_runner, ignore = "...")] annotations across the integration tests behind #[uutests::wasi_ignore(ReasonKey)], a proc-macro attribute defined in a new tests/uutests_procs crate.

Context: As per PR 14884 and PR 13687 flagged wasi_runner as a noisy, ad hoc cfg. It can't be replaced with target_os, since the tests always compile for the host (WASI can't spawn the child process they launch) — wasi_runner is the only signal a run is driving a wasm32-wasip1/wasm32-wasip2 binary via wasmtime. This doesn't remove the cfg, just the string-literal duplication around it: every reason is now defined once, alphabetically, in tests/uutests_procs/src/lib.rs 42 keys, down from an initial 57 after merging duplicates), including several that previously had no explanation at all.

#[uutests::wasi_ignore(Reason)] can also be applied to a mod { ... } block instead of one #[test] fn at a time; it recurses into nested modules and attaches the reason to every test inside. tee's linux_only module (21 tests) and truncate's fifo module (3 tests) use this instead of repeating the same key on every test.

Not touched: structural gates that aren't ignore-reasons (feat_diagnostics module gating, #[cfg(wasi_runner)] branches selecting alternate passing assertions).

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/id/setgid. tests/id/setgid is passing on 'main'. Maybe you have to rebase?

[codspeed]

Merging this PR will regress 4 benchmarks

⚡ 13 improved benchmarks
❌ 4 regressed benchmarks
✅ 382 untouched benchmarks
⏩ 54 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	three_39_bit_primes	545.9 ms	687 ms	-20.53%
❌	Simulation	five_38_bit_primes	1.7 s	1.9 s	-10.12%
❌	Simulation	sort_dictionary_order[500000]	1.9 s	2.1 s	-6.54%
❌	Simulation	rm_recursive_tree	13.7 ms	14.4 ms	-5.02%
⚡	Simulation	cut_fields_custom_delim	65.9 ms	51.9 ms	+27%
⚡	Simulation	cut_fields_tab	57.4 ms	45.5 ms	+26.24%
⚡	Simulation	cut_bytes	18.1 ms	15.5 ms	+16.69%
⚡	Simulation	check_sorted_utf8_locale	491.1 ms	422.9 ms	+16.13%
⚡	Simulation	sort_numeric_utf8_locale	40.8 ms	36.1 ms	+12.88%
⚡	Simulation	merge_single_file_utf8_locale	133.4 ms	119.3 ms	+11.83%
⚡	Simulation	cut_characters	25.4 ms	22.9 ms	+10.88%
⚡	Simulation	thirteen_39_bit_primes	9.3 s	8.5 s	+8.47%
⚡	Simulation	merge_pre_sorted_files_utf8_locale	251.9 ms	238 ms	+5.82%
⚡	Simulation	merge_pre_sorted_files	252.5 ms	238.8 ms	+5.74%
⚡	Simulation	sort_german_de_locale	295 ms	282.1 ms	+4.59%
⚡	Simulation	sort_case_sensitive[500000]	334.9 ms	321 ms	+4.32%
⚡	Simulation	sort_spill_to_tmp_files_utf8_locale	332.1 ms	321 ms	+3.44%

Tip

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

---

_{Comparing eduardomourar:refactor/wasi-ignore-reasons (764dc3f) with main (8f6a838)²}

Footnotes

1. 54 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. ↩

2. No successful run was found on main (ca3e965) during the generation of this report, so 8f6a838 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[eduardomourar]

Maybe we can remove this whole file and add those as comments in tests/uutests_procs/src/lib.rs