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feat(rome_analyze): add a warning for unused suppression comments #3718
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Summary
Fixes #3655
This PR tracks whether any signal was suppressed by a suppression comment. Once all analyzer passes have completed, a warning is emitted for all line suppressions that never actually recorder any hit. While the change is mostly straightforward, it still requires some special handling in
pull_diagnostics
to ensure we don't report unused suppression diagnostics in syntax-only passes of the analyzer (were all lint rules are disabled, and thus suppression comments are never hit)Test Plan
I updated the existing suppression tests to ensure the new diagnostic is correctly emitted, as well as the
SuppressionComments
snapshot test for thenoUnreachable
rule that was also impacted by this change (since it has a negative case to check that certain comment positions do not suppress the rule)