Allow setting merge strategy per branch
<!--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=27442) </details> <!--IssueSummary end--> ### Problem to solve Allow the merge strategy to be set at the branch level. ### Further details For example, if I have three protected branches (master, stage, production), I'd like to the ability to set the following merge strategies: - master: Fast-forward - stage: merge commit - production: fast-forward ### Documentation https://docs.gitlab.com/ee/user/project/merge_requests/squash_and_merge.html ### What does success look like, and how can we measure that? Ability to set the merge strategy at the branch level ### Links / references Customer ticket: https://gitlab.zendesk.com/agent/tickets/116976 (internal use)
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