fix(TPC): Force reneg when user unmutes the first time.

This ensures that the source signaling is sent before the mute state is sent in presence. Jicofo relies on mute state from presence to check if the sender limit has been reached.

modules/RTC/TraceablePeerConnection.js

         return Promise.resolve();
     }
 
+    // If a track is being added to the peerconnection for the first time, we want the source signaling to be sent to
+    // Jicofo before the mute state is sent over presence. Therefore, trigger a renegotiation in this case.
+    const negotiationNeeded = Boolean(!oldTrack || !this.localTracks.has(oldTrack?.rtcId));
+
     if (this._usesUnifiedPlan) {
         logger.debug(`${this} TPC.replaceTrack using unified plan`);
         const mediaType = newTrack?.getType() ?? oldTrack?.getType();
                     : this.tpcUtils.setEncodings(newTrack);
 
                 // Renegotiate only in the case of P2P. We rely on 'negotiationeeded' to be fired for JVB.
-                return configureEncodingsPromise.then(() => this.isP2P);
+                return configureEncodingsPromise.then(() => this.isP2P || negotiationNeeded);
             });
     }