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/apps/sdk/dataset.py

 import logging
 import os
 import json
-
 from flask import request
 from peewee import OperationalError
-
 from api import settings
 from api.db import FileSource, StatusEnum
 from api.db.db_models import File
     _, kb = KnowledgebaseService.get_by_id(dataset_id)
     settings.docStoreConn.delete({"knowledge_graph_kwd": ["graph", "subgraph", "entity", "relation"]}, search.index_name(kb.tenant_id), dataset_id)
 
-    return get_result(data=True)
+    return get_result(data=True)

api/db/services/document_service.py

     @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 = []