Fix room list often showing the wrong icons for calls (#32881)

* Give rooms with calls a proper accessible description

Besides improving accessibility, this makes it possible to check for the presence of a call indicator in the room list in Playwright tests.

* Make room list react to calls in a room, even when not connected to them

To use the results of CallStore.getRoom reactively, you need to listen for Call events, not ConnectedCalls events.

* Don't assume that every call starts off as a video call

If a Call object is created by way of someone starting a voice call, then of course the call's initial type needs to be 'voice'.

* Make room list items react to changes in call type

The type of a call may change over time; therefore room list items explicitly need to react to the changes.

* Update a call's type before notifying listeners of the change

If we notify listeners of a change in a call's type before actually making that change, the listeners will be working with glitched state. This would cause the room list to show the wrong call type in certain situations.

* Ignore the Vitest attachments directory

apps/web/test/test-utils/test-utils.ts

@@ -381,6 +381,7 @@ export function createStubMatrixRTC(): MatrixRTCSessionManager {
         const session = new EventEmitter() as MatrixRTCSession;
         session.memberships = [];
         session.getOldestMembership = () => undefined;
+        session.getConsensusCallIntent = () => "video";
         return session;
     });
     return {