Add test coverage for role-based location filtering in LocationModelView

[Copilot]

The get_query and get_count_query methods in LocationModelView filter locations based on user roles but lacked test coverage.

Changes

• Added test_get_query: Verifies that system administrators see all locations (including default) while non-system users see only non-default locations
• Added test_get_count_query: Verifies count queries apply the same role-based filters
• Test coverage: 4 scenarios per method covering system admin, repository admin, community admin, and no-role users
• Database cleanup: Added try/finally blocks to prevent test data contamination

Example

# System Administrator sees all locations
mock_user.roles = [MagicMock(name='System Administrator')]
with patch('invenio_files_rest.admin.current_user', mock_user):
    view = LocationModelView(Location, db.session)
    locations = view.get_query().all()
    # Returns both default and non-default locations

# Repository Administrator filtered
mock_user.roles = [MagicMock(name='Repository Administrator')]
with patch('invenio_files_rest.admin.current_user', mock_user):
    locations = view.get_query().all()
    # Returns only non-default locations (default=False)

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[Copilot]

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