do not fill merge request information when there are multiple commits
<!--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=415564) </details> <!--IssueSummary end--> <!-- This template is a great use for issues that are feature::additions or technical tasks for larger issues.--> ### Proposal atm, gitlab uses the text and summary of the first commit when creating a merge request. This is very annoying when patch series has multiple commits, because I have to delete merge title and summary manually. Please: - keep these information blank when there are multiple commits, or - keep title blank and fill text with summaries of contained commits
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