[clang] [alpha.webkit.UncountedCallArgsChecker] Ignore methods of WTF String classes. (PR #90704)

[Artem Dergachev via cfe-commits]

https://github.com/haoNoQ approved this pull request.

LGTM! The revert was caused entirely by something in the mock headers in tests right?

https://github.com/llvm/llvm-project/pull/90704