Send secretary's review reminders to secretary instead of assignee.
Send unconfirmed assignment reminders based on assignment age and CC secretaries.
Correctly separate open review reminders by review team.
Fixes#3482. Fixes#3324. Commit ready for merge.
- Legacy-Id: 19848
If a review assignment is rejected, withdrawn, marked no response, etc.,
and this leaves a review request without any assigned/accepted/completed
review assignments, return the request state to "requested", which means
it will be shown as an unassigned review in all interfaces.
Commit ready for merge.
- Legacy-Id: 16819