fixed missing dataset_type required on publications

src/schema/provenance_schema.yaml

@@ -608,8 +608,7 @@ ENTITIES:
         before_property_update_validators:
           - validate_recognized_dataset_type
         type: string
-        generated: true
-        immutable: true
+        required_on_create: true # Required for create via POST, not update via PUT
         description: "The assay types of this Dataset. Valid values are from UBKG are queried by schema_manager.get_valueset_dataset_type() using the Ontology API."
       collections:
         type: list