[test] Pre-commit cleanup

beat/backend/python/test/__init__.py

beat/backend/python/test/mocks.py

beat/backend/python/test/test_algorithm.py

beat/backend/python/test/test_data.py

beat/backend/python/test/test_data_loaders.py

beat/backend/python/test/test_database.py

beat/backend/python/test/test_database_view.py

beat/backend/python/test/test_databases_index.py

beat/backend/python/test/test_databases_provider.py

beat/backend/python/test/test_dbexecutor.py

beat/backend/python/test/test_executor.py

beat/backend/python/test/test_format_array.py

beat/backend/python/test/test_format_extends.py

beat/backend/python/test/test_format_missing_attributes.py

beat/backend/python/test/test_format_object.py

beat/backend/python/test/test_format_simple.py

beat/backend/python/test/test_format_unsafe_cast.py

beat/backend/python/test/test_format_valid_cast.py

beat/backend/python/test/test_hash.py

beat/backend/python/test/test_helpers.py