remove duplicate release resources

Author: sophia-bq

tests/integration/container/test_read_write_splitting.py

@@ -85,10 +85,6 @@ def clear_caches(self):
         RdsHostListProvider._is_primary_cluster_id_cache.clear()
         RdsHostListProvider._cluster_ids_to_update.clear()
 
-        # Force DNS refresh by clearing any internal connection pools
-        ConnectionProviderManager.release_resources()
-        ConnectionProviderManager.reset_provider()
-
     @pytest.fixture
     def props(self, plugin_config, conn_utils):
         plugin_name, plugin_value = plugin_config