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Summary
RedundantNullabilityCheck previously only verified whether package-info.java was annotated with @NullMarked. If an outer class or enclosing type declaration was marked with @NullMarked, redundant @NullMarked annotations on inner/nested classes, interfaces, records, and enums were silently overlooked.
This PR updates RedundantNullabilityCheck to inspect enclosing type declarations (using Util.getEnclosingTypeDeclaration) to flag redundant @NullMarked annotations on nested types, and adds comprehensive unit tests and test data for RedundantNullabilityCheck.
Test Plan
./gradlew :paper-checkstyle:check— all tests and checkstyle checks pass cleanly.