Draft: Add merge commits setting
What does this MR do and why?
Adds "Always use merge commits" settings to merge request settings.
Screenshots or screen recordings
How to set up and validate locally
- Visit project > settings > merge requests
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #429695