This PR adds pre-process checks to the Invite_Assignment and Assignment invitations to ensure that at most 3 reviewers are assigned/invited at any time
I've added a test to ensure that the pre-process validation is skipped if it is not provided in the venue request form (in the mock June cycle), but I'm not sure if this is necessary
This PR adds pre-process checks to the Invite_Assignment and Assignment invitations to ensure that at most 3 reviewers are assigned/invited at any time
Resolves #2220