Unify some admin controllers
What does this MR do?
Bring changes from EE
Are there points in the code the reviewer needs to double check?
EE at: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/6267
Does this MR meet the acceptance criteria?
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Tests added for this feature/bug - Conform by the code review guidelines
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Has been reviewed by a Backend maintainer
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What are the relevant issue numbers?
Edited by Lin Jen-Shin