Merge request approval menu has 2 expand selection handles (could be unified), one of them does not have interaction styling except for cursor
Identified in color audit, though unrelated to color specifically https://gitlab.com/gitlab-org/gitlab-design/issues/287
### Problem
Merge request approval menu has 2 expand selection handles (could be unified), one of them does not have interaction styling except for cursor

### Proposal
Simplify to one selection area that highlights the entire row
issue