[CE] Reduce diff with EE in `spec/policies`
CE backport of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/10425.
Related to https://gitlab.com/gitlab-org/gitlab-ee/issues/9506.
Does this MR meet the acceptance criteria?
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Tests added for this feature/bug -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides -
Security reports checked/validated by reviewer