add delay to test

Author: Bilal Al

tests/integration/test_streaming_e2e.py

@@ -1952,6 +1952,7 @@ async def test_streaming_status_changes(self):
 
         assert await factory.client().get_treatment('maldo', 'split1') == 'on'
         assert task.running()
+        await asyncio.sleep(2)
         assert 'PushStatusHandler' not in [t.name for t in threading.enumerate()]
 
         # Validate the SSE request