Enable automatic issue closing for non default branches
<!--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=14289) </details> <!--IssueSummary end--> Currently the automatic issue closing feature (see the `issue_closing_pattern` setting in `gitlab.yml`) only works when the commit is merged to the default branch. It would be nice if there was a way to specify the set of branches that would trigger automatic issue closing (e.g., `develop`).
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