fix: Knowledge workflow debug no user id

Author: zhanweizhang7

apps/knowledge/serializers/knowledge_workflow.py

@@ -185,6 +185,7 @@ def action(self, instance: Dict, user, with_valid=True):
                 "knowledge_action_id": knowledge_action_id,
                 "stream": True,
                 "workspace_id": self.data.get("workspace_id"),
+                "user_id": str(user.id),
                 **instance,
             },
             KnowledgeWorkflowPostHandler(None, knowledge_action_id),