[tests] Ensure Pytest does not treat TestCase as a unit test

tests/test_detectors.py

@@ -49,6 +49,7 @@ def get_absolute_path(relative_path: str) -> str:
 
 @dataclass
 class TestCase:
+    __test__ = False
     """Properties for detector test cases."""
     path: str
     """Path to video for test case."""