Add a confirmation modal when deleting mirrored repositories
<!--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=412793) </details> <!--IssueSummary end--> <!-- This template is a great use for issues that are feature::additions or technical tasks for larger issues.--> ### Proposal Add a confirmation modal for when user attempts to delete a mirrored repository. ![Screenshot_2023-05-24_at_15.14.30](https://gitlab.com/-/project/278964/uploads/42b42317633d6b767e78f7ce0b706da3/Screenshot_2023-05-24_at_15.14.30.png) Just accidentally clicked this instead of the refresh button, and it auto deleted the mirroring. Our team has a time difference with gitlabs admins so now I have to wait for multiple hours for them to come re-link the deleted repository. Pretty frustrating as a user.
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