Review .gitlab/CODEOWNERS entries
What does this MR do and why?
This MR fixes existing or removes orphaned entries in .gitlab/CODEOWNERS
as returned by https://gitlab.com/-/snippets/2085053.
Sequel of !55612 (merged).
Refs #216066 (comment 737140637)
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Peter Leitzen