refactor(test dataset): remove dropped ZEMA_DATASET_HASH tests

tests/test_zema_dataset.py

@@ -123,14 +123,6 @@ def test_dataset_attribute_ZEMA_DATASET_URL_in_all() -> None:
     assert "ZEMA_DATASET_URL" in dataset.__all__
 
 
-def test_dataset_has_attribute_ZEMA_DATASET_HASH() -> None:
-    assert hasattr(dataset, "ZEMA_DATASET_HASH")
-
-
-def test_dataset_attribute_ZEMA_DATASET_HASH_in_all() -> None:
-    assert "ZEMA_DATASET_HASH" in dataset.__all__
-
-
 def test_dataset_has_attribute_zema_samples() -> None:
     assert hasattr(dataset, "ZeMASamples")