refactor(api): use standalone graphon package (#34209)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

api/tasks/async_workflow_tasks.py

@@ -10,6 +10,7 @@ from datetime import UTC, datetime
 from typing import Any
 
 from celery import shared_task
+from graphon.runtime import GraphRuntimeState
 from sqlalchemy import select
 from sqlalchemy.orm import Session, sessionmaker
 
@@ -22,7 +23,6 @@ from core.app.layers.trigger_post_layer import TriggerPostLayer
 from core.db.session_factory import session_factory
 from core.repositories import DifyCoreRepositoryFactory
 from extensions.ext_database import db
-from graphon.runtime import GraphRuntimeState
 from models.account import Account
 from models.enums import CreatorUserRole, WorkflowRunTriggeredFrom, WorkflowTriggerStatus
 from models.model import App, EndUser, Tenant