Fix csv downloader and errors

python_tests/test_csv_download.py

@@ -11,10 +11,6 @@ import pytest
 from .wsgi_client import send_request
 
 
-if version.parse(optuna.__version__) < version.parse("3.4.0"):
-    pytest.skip("Study.metrics_name is introduced at v3.4.0", allow_module_level=True)
-
-
 def _validate_output(
     storage: optuna.storages.BaseStorage,
     correct_status: int,