Instance- or group-wide setting for remove_source_branch_after_merge
<!--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=37942) </details> <!--IssueSummary end--> ### Problem to solve With our [implementation](https://gitlab.com/gitlab-com/www-gitlab-com/merge_requests/27939) of [project-level default configuration](https://gitlab.com/gitlab-org/gitlab/issues/18283) for "Remove Source Branch After Merge", it is desirable to allow administrators to choose their preferred default setting for newly-created projects. ### Intended users * [Sidney (Systems Administrator)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#sidney-systems-administrator) ### Proposal As proposed in the [original community-contributed issue](https://gitlab.com/gitlab-org/gitlab/issues/18283), a group- or instance- wide setting to allow administrators to choose their preferred default would satisfy this use case. ### Permissions and Security ### Documentation ### Testing ### What does success look like, and how can we measure that? ### What is the type of buyer? ### Links / references
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