fix: Processing for document export sheet with more than 32 characters (#2740)

Author: shaohuzhang1

apps/dataset/serializers/document_serializers.py

@@ -703,6 +703,8 @@ def merge_problem(paragraph_list: List[Dict], problem_mapping_list: List[Dict],
 
         @staticmethod
         def reset_document_name(document_name):
+            if document_name is not None:
+                document_name = document_name.strip()[0:29]
             if document_name is None or not Utils.valid_sheet_name(document_name):
                 return "Sheet"
             return document_name.strip()