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

res/css/views/rooms/_LiveContentSummary.pcss

@@ -25,6 +25,10 @@ Please see LICENSE files in the repository root for full details.
             mask-image: url("$(res)/img/element-icons/call/video-call.svg");
         }
 
+        &.mx_LiveContentSummary_text_voice::before {
+            mask-image: url("$(res)/img/element-icons/call/voice-call.svg");
+        }
+
         &.mx_LiveContentSummary_text_active {
             color: $accent;