[10.x] Add broadcastAs function at BroadcastNotificationCreated (#48136)

* Add broadcastas function at BroadcastNotificationCreated, so it will get from the notification.

* Remove duplicate ;

---------

Co-authored-by: Raphael Cangucu <[email protected]>

Author: Raphael Canguçu

src/Illuminate/Notifications/Events/BroadcastNotificationCreated.php

@@ -120,4 +120,16 @@ public function broadcastType()
                     ? $this->notification->broadcastType()
                     : get_class($this->notification);
     }
+
+    /**
+     * Get the event name of the notification being broadcast.
+     *
+     * @return string
+     */
+    public function broadcastAs()
+    {
+        return method_exists($this->notification, 'broadcastAs')
+        ? $this->notification->broadcastAs()
+        : get_class($this->notification);
+    }
 }