Increase fidelity of MR merged emails
<!--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=516043) </details> <!--IssueSummary end--> ## Overview * Emailed received by users when an MR is approved, or set to auto-merge are high-fidelity HTML emails. * Conversely, emails received by users when an MR is merged are HTML although missing most of the design elements. ![Screenshot_2025-01-30_at_13.37.21](/uploads/d369b0233b2d022cc40e9470f80c553a/Screenshot_2025-01-30_at_13.37.21.png) * We should update the MR merged email to match the design of other emails relating to MR status changes. ## Implementation Plan * Update `app/views/notify/merged_merge_request_email.html.haml` to match the same template used in `app/views/notify/merge_when_pipeline_succeeds_email.html.haml` or other similar files.
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