Draft: Add 'Start a review' button to merge request overview
What does this MR do and why?
This MR adds a 'Start a review' button to the Overview page of a merge request when no draft comments are present.
Screenshots or screen recordings
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How to set up and validate locally
- Open any MR
- Scroll to the editor box
- Enter some comment
- Click 'Start a review' button
- A comment should be added as a draft comment and review bar should appear