Display loading link button in MR
The following discussion from !47475 should be addressed: - [ ] @pedroms started a [discussion](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/47475#note_448364652): (+1 comment) > > Or, alternatively, we can use a loading link button for the approval rules accordion button: > > ![CleanShot_2020-11-16_at_16.59.58](/uploads/3e383d12d5e4361f7d6cfc2c3c780a73/CleanShot_2020-11-16_at_16.59.58.gif)
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