Missing keyboard shortcut to navigate to previous commit from Commits page
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=427450) </details> <!--IssueSummary end--> In GitLab when looking a specific commit page, there is no keyboard shortcut to navigate to the previous commit, also called parent commit, even if this shortcut is present in MR page (**c** and **x** keys). The equivalent in GitHub is the **p** key when looking a specific commit page. I think p makes sense (previous, parent), but also c and x to be consistent with MR shortcuts. I think this should be added, thanks.
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