Support "r" and "up" shortcuts in work item comments
> Comments regression: If you select text in a comment in a legacy issuable or an MR then hit <kbd>r</kbd>, the selected text is inserted into a _new reply in that comment's thread_ as a blockquote. If you do the same thing when you have selected text _in the description_, then it will insert the blockquote into a new top-level comment. > > In a work item, it _always_ creates a new top-level comment. Something is broken there. > In a legacy issuable or an MR, if you focus the new reply input on a thread then press <kbd>up</kbd>, it will put your most recent comment in that thread in the edit state and allow you to edit it. This does not work on work items. via https://gitlab.com/gitlab-org/gitlab/-/issues/512715#note_2366873007
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