Include "number of commits" as possible variable for merge commit templates
<!--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> - [Work on this issue](https://contributors.gitlab.com/manage-issue?action=work&projectId=278964&issueIid=383062) - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=383062) </details> <!--IssueSummary end--> Mmerge commit message templates are a useful thing to configure in projects. The number of commits part of the merge would be a useful addition for the template variables. Available variables are here: https://docs.gitlab.com/ee/user/project/merge_requests/commit_templates.html#supported-variables-in-commit-templates Number of commmits is not one of these variables.
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