FR: add global [Enable "Delete source branch" option by default] setting
<!--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=465720) </details> <!--IssueSummary end--> ### Problem to solve When creating a new project, it always has \[Enable "Delete source branch" option by default\] option enabled (Settings -\> MR -\> Merge Options). * I cannot change \[Enable "Delete source branch" option by default\] setting other than on per-project level. If I create 10 projects and want to disable this option, I have to manually disable it 10 times (Project -\> Settings -\> MR -\> Merge Options). * I cannot change global default value of this setting for new projects created. ### User experience goal Changeable setting \[Enable "Delete source branch" option by default\], like it already exists on project-level (Settings -\> MR -\> Merge Options), but applicable as a global default value for new projects. ### Proposal Add a global option to change default \[Enable "Delete source branch" option by default\] value for new projects. ### See also * https://gitlab.com/gitlab-org/gitlab/-/issues/354460 - almost the same, but at group level, not global-default level
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