Add signature badge on 'changes' tab of merge request
### Proposal In https://gitlab.com/gitlab-org/gitlab/-/merge_requests/67582, the signature badge for commits is added on the 'Commits' tab. In the course of the review, @pedroms suggested to do this on the **'Changes'** tab as well. > :thinking: **suggestion**: to make this consistent when a commit is being viewed in the MR changes tab, can you please also add the verification badge to it?: > > See how this looks like in the repository homepage (e.g. ) vs how it looks when you click on a commit in an MR: > | Repository | Commit in MR | > |------------|--------------| > | ![image](https://gitlab.com/gitlab-org/gitlab/uploads/188db260c8844fd3c4085e450e84dcc3/image.png) | ![image](https://gitlab.com/gitlab-org/gitlab/uploads/e3e64786407e31ddbd077f6333eaecf9/image.png) | > > On smaller viewports, the badge can still be visible here (like we do in the commits list): > > ![image](https://gitlab.com/gitlab-org/gitlab/uploads/7048a88ac6ec8528b823465378e19625/image.png) > > Source: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/67582#note_649571729
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