chore: import upstream snapshot with attribution

tests/data/test_code_dataset_source.py

@@ -0,0 +1,16 @@
+from mlflow.data.code_dataset_source import CodeDatasetSource
+
+
+def test_code_dataset_source_from_path():
+    tags = {
+        "mlflow_source_type": "NOTEBOOK",
+        "mlflow_source_name": "some_random_notebook_path",
+    }
+    code_datasource = CodeDatasetSource(tags)
+    assert code_datasource.to_dict() == {
+        "tags": tags,
+    }
+
+
+def test_code_datasource_type():
+    assert CodeDatasetSource._get_source_type() == "code"