refactor: remove client-side cache key pulls

app/javascript/shared/helpers/BaseActionCableConnector.js

@@ -14,9 +14,6 @@ class BaseActionCableConnector {
   ) {
     const websocketURL = websocketHost ? `${websocketHost}/cable` : undefined;
 
-    this.connected = new Promise(resolve => {
-      this.resolveConnected = resolve;
-    });
     this.consumer = createConsumer(websocketURL);
     this.subscription = this.consumer.subscriptions.create(
       {
@@ -29,10 +26,6 @@ class BaseActionCableConnector {
         updatePresence() {
           this.perform('update_presence');
         },
-        connected: () => {
-          this.resolveConnected();
-          this.onConnected();
-        },
         received: this.onReceived,
         disconnected: () => {
           BaseActionCableConnector.isDisconnected = true;
@@ -81,9 +74,6 @@ class BaseActionCableConnector {
     }, RECONNECT_INTERVAL);
   };
 
-  // eslint-disable-next-line class-methods-use-this
-  onConnected = () => {};
-
   // eslint-disable-next-line class-methods-use-this
   onReconnect = () => {};