Add keyboard shortcut to edit snippet
<!--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=515459) </details> <!--IssueSummary end--> In the snippets UI (example: $1972953) there is no keyboard shortcut assigned to the <kbd>Edit</kbd> button. There is no easy way to work without a mouse to edit the snippet, you more or less have to use the mouse. It would be nice to have the user experience aligned with Issues, Merge Requests and Wiki. ## Screenshots ### Global help On the Snippets UI, when you press the <kbd>?</kbd> key to get help displayed on keyboard shortcuts, you find out there is no shortcut to quickly start editing. ![image](/uploads/dbbe637114e5c8dff831ad60177fa02a/image.png) Currently supported and mentioned on the "Keyboard shortcuts" help dialog are: Wiki, Epics, Issues and Merge Requests. ### Edit buttons Here is the tooltip of the <kbd>Edit</kbd> button on an Issue and a Merge Request, for example. It should be similar on a Snippet. ![image](/uploads/36278bb02cad28e7823e57599b1d0115/image.png) ![image](/uploads/79941d288e1185711424e4a17ab000c1/image.png)
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