Feat/admin drop user (#10342)

### What problem does this PR solve?

- Admin client support drop user.

Issue: #10241 

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

api/db/services/task_service.py

@@ -308,6 +308,12 @@ class TaskService(CommonService):
                     )
                 ).execute()
 
+    @classmethod
+    @DB.connection_context()
+    def delete_by_doc_ids(cls, doc_ids):
+        """Delete task associated with a document."""
+        return cls.model.delete().where(cls.model.doc_id.in_(doc_ids)).execute()
+
 
 def queue_tasks(doc: dict, bucket: str, name: str, priority: int):
     """Create and queue document processing tasks.