Test that CODEOWNERS reflects docs metadata changes
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=568156) </details> <!--IssueSummary end--> Capturing @eread's comment in https://gitlab.com/gitlab-org/gitlab/-/merge_requests/135408#note_1625396002 so it's not lost: > _Ideally we'd have a CI/CD job that would break if an update is done to metadata but not to \[CODEOWNERS]._ Not sure if it's possible, but capturing it just in case. ## Related items - Related to https://gitlab.com/gitlab-org/gitlab/-/merge_requests/135408+ where the idea was voiced
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