As an editor I want to avoid inviting a co-author as a reviewer by mistake

User story

Anonymized report from editor:

"I accidentally invited a co-author to review a paper. I feel really embarrassed, but I also think this was a mistake that was very easy to make and could be prevented. I am pretty sure it happened because I didn't realize there were co-authors because the review system only shows the first author, and you have to click on the Editor Assignment to see the full author list. Usually I will see this when I'm assigned a paper at the Unassigned stage, but it's really hard to see after it gets in the Review list, and since the paper was transferred."

Proposed solution

"...I wonder if there is anything that can be done in Janeway, either to give a warning if you try to invite an author of the paper, or to be able to see the full author list more easily when making the assignments."

Notes from Dev team

• As an editor when I am making a peer review assignment, if I select an author of the paper as a reviewer, I should see a warning message.
• As an editor, when I'm in the review stage of a paper, I can see all the authors assigned to it (rather than just the correspondance author)

Start by tracing the editor peer-review assignment flow and the review-stage paper view described in the issue. Check how authors and reviewers are currently loaded and displayed. Done means an editor is warned when selecting a paper author and can see the full author list while assigning reviews.