Organization tool removes and adds persons that are already assigned

[baumeister25]

Expected behavior

As a zenhub user, who is assigned to a team or board,
I want to not get notified by being removed and added to a board I'm part of

Actual behavior

The synchronisation process seems to remove and add users to boards instead of realizing that they're there and leaving them. Hence, users get notifications of being removed and added to teams

Steps to reproduce (bug) / Use Case of feature request (enhancement)

1. Trigger the sync process and check what it does