Repo mirror: Add delete confirmation prompt

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Problem to solve

Users can easily accidentally delete their repo mirror

Intended users

All owners and maintainers.

Further details

Prompted by customer report that they accidentally deleted their repo mirror: https://gitlab.zendesk.com/agent/tickets/124397

Proposal

While we have a delete button:

we should add a prompt to have users confirm that they want to delete the repository mirror.

What does success look like, and how can we measure that?

Users don't accidentally delete repo mirrors.