Remove the meeting_user when removing a user from a meeting#3206

luisa-beerboom merged 25 commits intoOpenSlides:mainOpenSlides/openslides-backend:mainfrom

luisa-beerboom:2111-require-groups-in-meeting-usersluisa-beerboom/openslides-backend:2111-require-groups-in-meeting-usersCopy head branch name to clipboard