Subgroup level protected branches
<!--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=522907) </details> <!--IssueSummary end--> ## Problem As part of https://gitlab.com/groups/gitlab-org/-/epics/8679 we introduced protected branches at the group level. We explicitly did not implement support for configuring them at the subgroup level in the initial implementation. Some users would like subgroup owners to be able to set these rules for their subgroup only. At present the only workaround is for them to all be given owner access at the root group level to set these. ## Solution Add this functionality to the subgroup level as well.
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