<!--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=210507) </details> <!--IssueSummary end--> Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/199790#note_294461557 Continuing with our iterative approach. This MR will convert the target branch dropdown into a Vue component. Step 1: Easiest boring solution first > https://gitlab.com/gitlab-org/gitlab/-/merge_requests/26053 Step 2: Improved solution by converting it to a Vue component > this MR