Add wait after connection close for async telemetry submission

Author: samikshya-db

tests/e2e/test_telemetry_e2e.py

@@ -193,6 +193,8 @@ def test_telemetry_flags(self, telemetry_interceptors, enable_telemetry,
                     cursor.execute("SELECT 1")
                     cursor.fetchone()
 
+            # Give time for async telemetry submission after connection closes
+            time.sleep(0.5)
             self.verify_events(captured_events, captured_futures, expected_count)
 
             # Assert statement execution on latency event (if events exist)