fix(api): unsubscribe final event in event stream on client disconnect

Author: asaf

packages/api/src/flux0_api/sessions.py

@@ -314,6 +314,7 @@ async def subscriber_final(emitted_event: EmittedEvent) -> None:
         # Unsubscribe when client disconnects
         print("unsubscribed from correlation_id", correlation_id)
         event_emitter.unsubscribe_processed(correlation_id, subscriber)
+        event_emitter.unsubscribe_final(correlation_id, subscriber_final)
         # Explicitly send a termination event before closing
         # yield "event: close\ndata: {}\n\n"