Support using Element Call for voice calls in DMs (#30817)

* Add voiceOnly options.

* tweaks

* Nearly working demo

* Lots of minor fixes

* Better working version

* remove unused payload

* bits and pieces

* Cleanup based on new hints

* Simple refactor for skipLobby (and remove returnToLobby)

* Tidyup

* Remove unused tests

* Update tests for voice calls

* Add video room support.

* Add a test for video rooms

* tidy

* remove console log line

* lint and tests

* Bunch of fixes

* Fixes

* Use correct title

* make linter happier

* Update tests

* cleanup

* Drop only

* update snaps

* Document

* lint

* Update snapshots

* Remove duplicate test

* add brackets

* fix jest

test/test-utils/call.ts

@@ -181,6 +181,7 @@ export function setUpClientRoomAndStores(): {
     const roomSession = new MockEventEmitter({
         memberships: [],
         getOldestMembership: jest.fn().mockReturnValue(undefined),
+        getConsensusCallIntent: jest.fn().mockReturnValue(undefined),
         room,
     }) as Mocked<MatrixRTCSession>;