Backport "Add suppression if nowarn differs" to 3.7.3 #23715
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Fixes #23651 The [previous fix](#22383) for the same `@nowarn` attached to multiple elements should have compared the `annotPos` to identify duplicates (instead of the target range). This commit defers detecting "bad" or duplicate suppressions (which originate with the same annotation) to report time, after the suppression is "unused"; there are few nowarns per file and fewer that are unused. While checking for a suppression, mark matching unused suppressions as "superseded", so that if they remain unused, the warning can add an "audit" that the nowarn matched a diagnostic (but was superseded by some other nowarn). ~This commit goes further and checks for duplicates (including whether the filters look the same).~ ~If it finds a duplicate where the `annotPos` differs, warn about the user-written annotation.~ ~Filters match each other if they are the same type and, if they have a pattern, the string representations of the patterns are equal.~ [Cherry-picked 40843f7]
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Backports #23652 to the 3.7.3-RC2.
PR submitted by the release tooling.
[skip ci]