Add teardown_method to clear telemetry factory state between tests

Without this cleanup, tests were sharing telemetry clients because they
all used the same host key ("test"), causing test pollution. The first
test would create an enabled client, and subsequent tests would reuse it
even when they expected a disabled client.

Author: samikshya-db

tests/unit/test_telemetry.py

@@ -367,6 +367,10 @@ def test_connection_failure_sends_correct_telemetry_payload(
 class TestTelemetryFeatureFlag:
     """Tests the interaction between the telemetry feature flag and connection parameters."""
 
+    def teardown_method(self):
+        """Clean up telemetry factory state after each test to prevent test pollution."""
+        TelemetryClientFactory._clients.clear()
+
     def _mock_ff_response(self, mock_http_request, enabled: bool):
         """Helper method to mock feature flag response for unified HTTP client."""
         mock_response = MagicMock()