[FIX] Fix rate limit exceeded test by adding initial request

- Add initial request to consume burst limit
- Keep explicit rate limit state control
- Retain error message validation

tests/integration/test_error_handling.py

@@ -61,6 +61,9 @@ def test_rate_limit_exceeded(
             calls=1, period=1.0, _burst=1
         )
 
+        # Make first request to use up the burst
+        strict_rate_limit_connector.get_principales_variables()
+
         # Force rate limited state
         now = time.monotonic()
         strict_rate_limit_connector.rate_limiter._window.clear()