ruff

62859dfd - Emit a warning instead of an error for unknown rule selectors (#26113)

Emit a warning instead of an error for unknown rule selectors (#26113) Summary -- This PR fixes #14443 by deferring rule parsing. This allows deserializing configuration files and CLI arguments with unknown rule selectors and enables us to emit a warning instead of a hard error when encountering an unknown selector. This will also help with #25887 because we can also defer parsing until we have an accurate `preview` setting for checking whether human-readable names should be allowed. I've left some of this infrastructure in place in this PR, with the `preview` argument currently unused. Test Plan -- Existing tests updated to show warnings instead of errors