Fix:When deleting a knowledge base that is currently performing a parsing task, the parsing queue will not be deleted! (#9018)

### What problem does this PR solve?

https://github.com/infiniflow/ragflow/issues/8995

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

---------

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

api/db/services/document_service.py

@@ -229,8 +229,10 @@ class DocumentService(CommonService):
     @classmethod
     @DB.connection_context()
     def remove_document(cls, doc, tenant_id):
+        from api.db.services.task_service import TaskService
         cls.clear_chunk_num(doc.id)
         try:
+            TaskService.filter_delete(Task.doc_id == doc.id)
             page = 0
             page_size = 1000
             all_chunk_ids = []