Fix MatrixRTC membership manager failing to rejoin in a race condition (sync...

Fix MatrixRTC membership manager failing to rejoin in a race condition (sync vs not found response) (#4861)

* add test run helper to allow running long tests in vs code

* deprecate IDeferred (as its associated defer method is also deprecated and its just a type rename to PromiseWithResolvers)

* Improve docs and readability of MembershipManager.spec.ts

* Intoduce test for a race condition which results in a state where the state event and the hasMemberStateEvent variable diverge

* fix room state and membership manager state diverging. See:
https://github.com/element-hq/element-call-rageshakes/issues/10609
https://github.com/element-hq/element-call-rageshakes/issues/10594
https://github.com/element-hq/element-call-rageshakes/issues/9902

* logging, docstings and variable name improvements

* review

* review pending timers