Use new matrixRTC calling (#11792)

* initial

Signed-off-by: Timo K <toger5@hotmail.de>

* cleanup1

Signed-off-by: Timo K <toger5@hotmail.de>

* bring back call timer

Signed-off-by: Timo K <toger5@hotmail.de>

* more cleanup and test removals

Signed-off-by: Timo K <toger5@hotmail.de>

* remove event

Signed-off-by: Timo K <toger5@hotmail.de>

* cleanups and minor fixes

Signed-off-by: Timo K <toger5@hotmail.de>

* add matrixRTC to stubClient

Signed-off-by: Timo K <toger5@hotmail.de>

* update tests (some got removed)
The removal is a consequence of EW now doing less call logic.
More logic is done by the js sdk (MatrixRTCSession)
And therefore in EC itself.

Signed-off-by: Timo K <toger5@hotmail.de>

* cleanups

Signed-off-by: Timo K <toger5@hotmail.de>

* mock the session

Signed-off-by: Timo K <toger5@hotmail.de>

* lint

Signed-off-by: Timo K <toger5@hotmail.de>

* remove GroupCallDuration

Signed-off-by: Timo K <toger5@hotmail.de>

* review and fixing tests

Signed-off-by: Timo K <toger5@hotmail.de>

---------

Signed-off-by: Timo K <toger5@hotmail.de>

test/test-utils/call.ts

@@ -35,6 +35,9 @@ export class MockedCall extends Call {
                 url: "https://example.org",
                 name: "Group call",
                 creatorUserId: "@alice:example.org",
+                // waitForIframeLoad = false, makes the widget API wait for the 'contentLoaded' event instead.
+                // This is how the EC is designed, but for backwards compatibility (full mesh) we currently need to use waitForIframeLoad = true
+                // waitForIframeLoad: false
             },
             room.client,
         );