fix(cache): release compilation-scoped plugin state on rebuild

[matthewdavis-oai]

Summary

Release compilation-scoped plugin maps when a watch rebuild replaces the preceding compilation.

The native CSS, SRI, and Rsdoctor plugins retain several maps keyed by monotonically increasing CompilationId; the corresponding entries were not fully removed from clear_cache(old_id). Repeated rebuilds can therefore retain hooks, integrity/context state, or diagnostic/module metadata for every prior generation.

This change uses the existing plugin lifecycle hook and only removes state for the completed compilation:

• CSS: COMPILATION_HOOKS_MAP;
• SRI: COMPILATION_INTEGRITY_MAP and COMPILATION_CONTEXT_MAP;
• Rsdoctor: module, entrypoint, JSON-size, and active-export-usage maps alongside the existing hook-map cleanup.

No public API, option, or compilation behavior changes.

Validation

• Source audit/regression confirms every compilation-keyed map in these three plugins has a matching removal (8/8 entries cleared; seven were previously missing).
• An optimized native-binding watch smoke enables native CSS, SRI, Rsdoctor, and HMR, performs repeated edits, and verifies emitted updates and diagnostics remain correct.
• rustfmt --edition 2024 --check crates/rspack_plugin_css/src/plugin/impl_plugin_for_css_plugin.rs crates/rspack_plugin_sri/src/lib.rs crates/rspack_plugin_rsdoctor/src/plugin.rs and git diff --check pass.

This is independent of the ModuleGraphConnectionWrapper lifecycle fix in #14772.

[matthewdavis-oai]

Superseded by #14772, where the validated changes are now stacked for a single review surface.

[codspeed-hq]

Merging this PR will not alter performance

✅ 43 untouched benchmarks
⏩ 47 skipped benchmarks¹

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_{Comparing matthewdavis-oai:matthewdavis-oai/rspack-compilation-cache-cleanup (7d23f7b) with main (03080ba)}

Footnotes

1. 47 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. ↩