feat: Drop conference duration component and use the data form.

JitsiConferenceEventManager.js

     this.chatRoomForwarder.forward(XMPPEvents.MEETING_ID_SET,
         JitsiConferenceEvents.CONFERENCE_UNIQUE_ID_SET);
 
+    this.chatRoomForwarder.forward(XMPPEvents.CONFERENCE_TIMESTAMP_RECEIVED,
+        JitsiConferenceEvents.CONFERENCE_CREATED_TIMESTAMP);
+
     // send some analytics events
     chatRoom.addListener(XMPPEvents.MUC_JOINED,
         () => {
             conference.eventEmitter.emit(JitsiConferenceEvents.STARTED_MUTED);
         });
 
-    this._addConferenceXMPPListener(XMPPEvents.CONFERENCE_TIMESTAMP_RECEIVED,
-        createdTimestamp => {
-            conference.eventEmitter.emit(JitsiConferenceEvents.CONFERENCE_CREATED_TIMESTAMP, createdTimestamp);
-        });
-
     this._addConferenceXMPPListener(XMPPEvents.AV_MODERATION_CHANGED,
         (value, mediaType, actorJid) => {
             const actorParticipant = conference.getParticipants().find(p => p.getJid() === actorJid);

modules/xmpp/ChatRoom.js

                 logger.warn('No meeting ID from backend');
             }
 
+            const meetingCreatedTSValEl
+                = $(result).find('>query>x[type="result"]>field[var="muc#roominfo_created_timestamp"]>value');
+
+            if (meetingCreatedTSValEl.length) {
+                this.eventEmitter.emit(XMPPEvents.CONFERENCE_TIMESTAMP_RECEIVED, meetingCreatedTSValEl.text());
+            } else {
+                logger.warn('No conference duration from backend');
+            }
+
             const membersOnly = $(result).find('>query>feature[var="muc_membersonly"]').length === 1;
 
             const lobbyRoomField

modules/xmpp/xmpp.js

                 this._components.push(this.speakerStatsComponentAddress);
             }
 
-            if (identity.type === 'conference_duration') {
-                this.conferenceDurationComponentAddress = identity.name;
-                this._components.push(this.conferenceDurationComponentAddress);
-            }
-
             if (identity.type === 'lobbyrooms') {
                 this.lobbySupported = true;
                 const processLobbyFeatures = f => {
 
         if (parsedJson[JITSI_MEET_MUC_TYPE] === 'speakerstats' && parsedJson.users) {
             this.eventEmitter.emit(XMPPEvents.SPEAKER_STATS_RECEIVED, parsedJson.users);
-        } else if (parsedJson[JITSI_MEET_MUC_TYPE] === 'conference_duration' && parsedJson.created_timestamp) {
-            this.eventEmitter.emit(XMPPEvents.CONFERENCE_TIMESTAMP_RECEIVED, parsedJson.created_timestamp);
         } else if (parsedJson[JITSI_MEET_MUC_TYPE] === 'av_moderation') {
             this.eventEmitter.emit(XMPPEvents.AV_MODERATION_RECEIVED, parsedJson);
         } else if (parsedJson[JITSI_MEET_MUC_TYPE] === 'breakout_rooms') {