* Extract some setup code out of the call tests
* Don't force all rooms to be rechecked for calls when starting a call
* Remove misleading unused group call callbacks
The GroupCallEventHandler hasn't been relevant to our Element Call group calls for some time; instead we look at the state of the MatrixRTCSessionManager and WidgetStore to determine whether a call has been started.
* Avoid creating multiple call objects for the same widget
* fix test
---------
Co-authored-by: Will Hunt <will@half-shot.uk>
