MM-56071: Track multiple threads (#25775)

We can have 2 types of threads open at the same time. One from
the thread view, and another from RHS.

We add another variable to distinguish between the 2 states.

In future, if we have the ability for more than 2 threads, then
we would need to track by threadID.

https://mattermost.atlassian.net/browse/MM-56071

```release-note
NONE
```

webapp/platform/client/src/websocket.ts

@@ -396,9 +396,10 @@ export default class WebSocketClient {
         this.sendMessage('presence', data, callback);
     }
 
-    updateActiveThread(channelId: string, callback?: (msg: any) => void) {
+    updateActiveThread(isThreadView: boolean, channelId: string, callback?: (msg: any) => void) {
         const data = {
             thread_channel_id: channelId,
+            is_thread_view: isThreadView,
         };
         this.sendMessage('presence', data, callback);
     }