fix(pytest): support parameterized tests with unbracketed names (e.g., pytest.HIDDEN_PARAM)

[MOHAMMED WASIM KHAN (wasim-builds)]

Summary

Fixes #25795

When a test is parameterized using pytest.HIDDEN_PARAM (e.g. @pytest.mark.parametrize('setup', [pytest.param('setup', id=pytest.HIDDEN_PARAM)])), pytest does not append a bracketed parameter identifier [...] to the test item name. During test discovery, vscode_pytest.process_parameterized_test attempted test_node['name'].split('[', 1), raising:
ValueError: not enough values to unpack (expected 2, got 1)
and failing test discovery.

Changes

1. In python_files/vscode_pytest/__init__.py:
   • Updated is_parameterized check in build_test_tree to verify '[' in test_node['name'] in addition to hasattr(test_case, 'callspec').
   • In process_parameterized_test, added a guard returning test_node if '[' not in test_node['name'].
   • Updated file node parenting in build_test_tree to handle tests where not is_parameterized.
2. Added unit test in python_files/tests/pytestadapter/test_utils.py verifying that tests using pytest.HIDDEN_PARAM discover successfully and build the expected test tree without errors.

Verification

• Ran python3 -m pytest python_files/tests/pytestadapter/test_utils.py (all 4 passed).

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