Flag Reviewer Requests if selected email matches an email in contributing author list for submission

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Describe the problem you would like to solve
One of editors recently inadvertently invited a reviewer to a manuscript who was listed as Contributing author (not a participant in the workflow). The editor assumed that the reviewer selection component would flag this but it turns out it does not. It only flags for a conflict if the selected reviewer is one of the assigned participants.

Describe the solution you’d like
Our feature request is to add a trigger that flags a reviewer selection if the email matches any of the contributing author emails on file for the submission.

Who is asking for this feature?
Editors and editorial management

Additional information
This is issue was discussed here: Contributing (non corresponding) author invited as reviewer!