refactor: Delete the dataset to verify whether it is in use (#5112)

api/controllers/service_api/dataset/error.py

@@ -71,3 +71,9 @@ class InvalidMetadataError(BaseHTTPException):
     error_code = 'invalid_metadata'
     description = "The metadata content is incorrect. Please check and verify."
     code = 400
+
+
+class DatasetInUseError(BaseHTTPException):
+    error_code = 'dataset_in_use'
+    description = "The dataset is being used by some apps. Please remove the dataset from the apps before deleting it."
+    code = 409