refactor(multi-stream) refactor virtual screenshare creation and support plan-b clients (#11445)

* fix(multi-stream) update selector to find ss track by videoType or mediaType

* ref(multi-stream) move fake ss creation logic and support video type changed

* refactor(multi-stream) decouple sending and receiving multiple screenshare streams

* fix(multi-stream) fix receiver constraints with signaling and without multi-stream

* fix(mutli-stream) ensure plan b original SS thumbnail displays avatar

* fix(multi-stream) show fake SS for plan b sender

* refactor(multi-stream) poc for moving SS creation to state listener

* remove reference to fake SS creation

* fix lint errors

* rename to virtual screenshare participants

* fix minor bugs

* rename participant subscriber to specify web support only

react/features/connection-stats/components/ConnectionStatsTable.js

@@ -94,7 +94,7 @@ type Props = {
     /**
      * Whether or not the statistics are for screen share.
      */
-    isFakeScreenShareParticipant: boolean,
+    isVirtualScreenshareParticipant: boolean,
 
     /**
      * The send-side max enabled resolution (aka the highest layer that is not
@@ -240,12 +240,12 @@ class ConnectionStatsTable extends Component<Props> {
             classes,
             disableShowMoreStats,
             enableSaveLogs,
-            isFakeScreenShareParticipant,
+            isVirtualScreenshareParticipant,
             isLocalVideo
         } = this.props;
         const className = clsx(classes.connectionStatsTable, { [classes.mobile]: isMobileBrowser() });
 
-        if (isFakeScreenShareParticipant) {
+        if (isVirtualScreenshareParticipant) {
             return this._renderScreenShareStatus();
         }