Combine clone button markup in a single partial
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The following discussion from !17752 should be addressed:
- [ ] @pslaughter started a [discussion](https://gitlab.com/gitlab-org/gitlab/merge_requests/17752#note_264450655):
> **nitpick (non-blocking):** These two renders are always used with eachother which implies that there's some leaky encapsulation... They should probably be the same partial. :shrug:
>
> Since this is a little out of scope for this MR, let's handle this in a follow up ~"technical debt" :smile:
issue