Move "Add General Comment" into the review menu.
Review Request #12896 — Created March 16, 2023 and submitted
This change adds a new action to move "Add General Comment" inside the
review menu. This was the last review-related action that still existed
on the review request bar, and it felt weird to have it there when
everything else had moved.
- Used the new action and saw that it correctly popped up the general
- Ran unit tests.