test(zip for forum): Prevent opening file explorers during CI tests.

Added an autouse=True fixture that mocks _open_file_explorer_and_select to
prevent it from actually trying to open file explorers during tests.
This is similar to the existing mock_webbrowser_open_url fixture that was
already in place to prevent browser opening during tests.

Author: amilcarlucas

tests/acceptance_zip_for_forum_help.py

@@ -76,6 +76,16 @@ def mock_webbrowser_open_url() -> Iterator[MagicMock]:
         yield mock_browser
 
 
+@pytest.fixture(autouse=True)
+def mock_open_file_explorer() -> Iterator[MagicMock]:
+    """Prevent tests from opening file explorer which blocks in CI without a display."""
+    with patch(
+        "ardupilot_methodic_configurator.data_model_parameter_editor.ParameterEditor._open_file_explorer_and_select",
+        autospec=True,
+    ) as mock_explorer:
+        yield mock_explorer
+
+
 def get_filesystem(parameter_editor: ParameterEditor) -> LocalFilesystem:
     """Helper to access the underlying filesystem with relaxed typing."""
     return parameter_editor._local_filesystem