fix(tests): resolve ruff F821 errors for DuplicateTest in test_duplicates.py

[Copilot]

Ruff could not statically resolve DuplicateTest because it was injected into module globals dynamically via globals()["DuplicateTest"] = _DuplicateTest inside a pytest fixture.

Changes

• Module-level mocking + direct import: sys.modules patching for arcpy, its submodules, and xxhash is now done at module level before a direct from sweeper.sweepers.duplicates import DuplicateTest, making the name statically visible to ruff. Uses # ruff: isort: off/on guards to suppress the intentional import order violation — consistent with test_addresses.py.
• Restored cleanup fixture: A _restore_sys_modules module-scoped fixture undoes the sys.modules patching after all tests in the module complete, preserving test isolation.

# ruff: isort: off
arcpy_mock = MagicMock()
sys.modules["arcpy"] = arcpy_mock
# ... other submodules + xxhash ...

from sweeper.sweepers.duplicates import DuplicateTest  # noqa: E402
# ruff: isort: on

@pytest.fixture(autouse=True, scope="module")
def _restore_sys_modules():
    yield
    # restore originals ...

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@            Coverage Diff             @@
##             del-bug     #148   +/-   ##
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  Coverage           ?   36.43%           
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  Files              ?       13           
  Lines              ?      785           
  Branches           ?      139           
==========================================
  Hits               ?      286           
  Misses             ?      492           
  Partials           ?        7           

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