Delegate the sending of call notifications to Element Call (#30507)

* Move Element Call event types to a more appropriate file

To remove the potential for import cycles in src/models/Call.ts, which I was accidentally creating when I tried to reference data from the RoomListStore in the ElementCall class.

* Make sure ElementCall tests clean up the call object

* Upgrade Element Call to v0.14.1

* Delegate the sending of call notifications to Element Call

As of Element Call version 0.14.0, the widget is now capable of sending call notifications itself if we just request this with the sendNotificationType URL parameter. This makes Element Web's group call code a little bit more succinct.

* Fix createRoom test

package.json

@@ -186,7 +186,7 @@
         "@babel/preset-typescript": "^7.12.7",
         "@babel/runtime": "^7.12.5",
         "@casualbot/jest-sonar-reporter": "2.2.7",
-        "@element-hq/element-call-embedded": "0.13.1",
+        "@element-hq/element-call-embedded": "0.14.1",
         "@element-hq/element-web-playwright-common": "^1.4.4",
         "@peculiar/webcrypto": "^1.4.3",
         "@playwright/test": "^1.50.1",