Improve Related Merge Requests
<!--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=416138) </details> <!--IssueSummary end--> <!-- This template is a great use for issues that are feature::additions or technical tasks for larger issues.--> ### Proposal When a MR with a commit that references an issue is merged the referenced MR is not listed in the "Related merge requests" section of the issue. If the MR text itself doesn't have a reference, it doesn't show up in the "Related merge requests" section. This proposal is to make relating an MR automatic if it is mentioned in a commit or to create an option to enable or disable it as the default behavior. <!-- Label reminders Use the following resources to find the appropriate labels: - Use only one tier label choosing the lowest tier this is intended for - https://gitlab.com/gitlab-org/gitlab/-/labels - https://about.gitlab.com/handbook/product/categories/features/ -->
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