Add clone button to merge requests
## Problems to solve I work on quite a large number of projects and regularly get pinged to review an MR for a project I have not previously cloned. At the moment I have to navigate to the project homepage to grab the clone URL. It would be great to have this available on the MR itself. @phikai wdyt? Would you be happy with this additional "clutter"? @katokpara do you have any thoughts? ## Design - https://gitlab.com/gitlab-org/gitlab/-/issues/329844/designs/Modal1.png ![check-out-branch](/uploads/8dc473692cdc26a1acf9543425510d2d/check-out-branch.png) - [Figma spec 🔗](https://www.figma.com/file/SMqXMmAVsxJZq9SklTRn3u/Check-out-modal?node-id=1%3A40)
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