Round Robin assignment for existing unanswered emails

Business problem

The Round Robin assignment logic currently only triggers for new incoming emails, leaving existing unanswered emails unassigned. This prevents agents from efficiently clearing the backlog when they come online or when availability changes.

Wished result

A seamless Round Robin system that automatically redistributes or assigns all pending unanswered emails in the queue, regardless of whether they were newly received or already existing in the system, based on agent availability.