fix(avmoderation,breakout-rooms) dispose handlers when leaving

Both of this features listen for events in the XMPP connection. Thus, if we join
another meeting over the same connection we might still receive some events on
the old event handler.

Stop listening for events from the components as soon as the leave operation is
triggered.

modules/xmpp/AVModeration.js

         this._whitelistAudio = [];
         this._whitelistVideo = [];
 
-        this._xmpp.addListener(XMPPEvents.AV_MODERATION_RECEIVED, this._onMessage.bind(this));
+        this._onMessage = this._onMessage.bind(this);
+        this._xmpp.addListener(XMPPEvents.AV_MODERATION_RECEIVED, this._onMessage);
+    }
+
+    /**
+     * Stops listening for events.
+     */
+    dispose() {
+        this._xmpp.removeListener(XMPPEvents.AV_MODERATION_RECEIVED, this._onMessage);
     }
 
     /**

modules/xmpp/BreakoutRooms.js

     constructor(room) {
         this.room = room;
 
-        this.room.xmpp.addListener(XMPPEvents.BREAKOUT_ROOMS_EVENT, this._handleMessages.bind(this));
+        this._handleMessages = this._handleMessages.bind(this);
+        this.room.xmpp.addListener(XMPPEvents.BREAKOUT_ROOMS_EVENT, this._handleMessages);
 
         this._rooms = {};
     }
 
+    /**
+     * Stops listening for events.
+     */
+    dispose() {
+        this.room.xmpp.removeListener(XMPPEvents.BREAKOUT_ROOMS_EVENT, this._handleMessages);
+    }
+
     /**
      * Creates a breakout room with the given subject.
      *

modules/xmpp/ChatRoom.js

      * rejected.
      */
     leave() {
+        this.avModeration.dispose();
+        this.breakoutRooms.dispose();
+
         const promises = [];
 
         this.lobby?.lobbyRoom && promises.push(this.lobby.leave());