When in the Project > Merge Request Screen, the Merge Request Button Should Redirect to Existing Branch MR First, if Exists.
<!--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=393173) </details> <!--IssueSummary end--> <!-- This template is a great use for issues that are feature::additions or technical tasks for larger issues.--> ### Proposal When in the `Project` > `Merge Request Screen` and the `Merge Request` button is clicked: ![Screenshot_2023-02-24_at_13.13.58](/uploads/ebbcbd13ef1a7f1e65fc7c5b40602822/Screenshot_2023-02-24_at_13.13.58.png) The user should be redirected to the existing merge request associated with the branch, **if it already exists**, rather than seeing this screen: ![Screenshot_2023-02-24_at_13.11.44](/uploads/09dc24b95bc13dd4b3e329f8427dd74e/Screenshot_2023-02-24_at_13.11.44.png)
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