Remove skip_web_ui_code_owner_validations feature flag
This security fix !31283 (merged) was feature flagged to allow self-hosted installations to disable it. Some customers' workflows depend on being able to click Merge in the UI even if CODEOWNERS doesn't let you push the merge.
This feature flag should ideally not exist for too long. Its existence represents a disconnect between intended and actual usage of CODEOWNERS.
Related: