refactor: inherit ABC in AppQueueManager for proper abstract method usage (#32461)

api/core/app/apps/base_app_queue_manager.py

@@ -2,7 +2,7 @@ import logging
 import queue
 import threading
 import time
-from abc import abstractmethod
+from abc import ABC, abstractmethod
 from enum import IntEnum, auto
 from typing import Any
 
@@ -31,7 +31,7 @@ class PublishFrom(IntEnum):
     TASK_PIPELINE = auto()
 
 
-class AppQueueManager:
+class AppQueueManager(ABC):
     def __init__(self, task_id: str, user_id: str, invoke_from: InvokeFrom):
         if not user_id:
             raise ValueError("user is required")