Lint for WEB_FEATURES.yml not matching any tests #56182
Description
#56175 had mapped uievents/legacy-domevents-tests/submissions/Microsoft/WheelEvent.* using WEB_FEATURES.yml, but those files are support files in the manifest, not files.
It would be useful to lint for patterns that don't match any tests even if they do match some files to avoid this sort of situation.