Migrate blockchain-event-bridge app to centralized aitbc package utilities

- Migrate polling/batch.py and polling/conditions.py from logging to aitbc.get_logger

apps/blockchain-event-bridge/src/blockchain_event_bridge/event_subscribers/blocks.py

@@ -1,9 +1,10 @@
 """Block event subscriber for gossip broker."""
 
 import asyncio
-import logging
 from typing import TYPE_CHECKING, Any, Dict
 
+from aitbc.aitbc_logging import get_logger
+
 from ..config import Settings
 from ..metrics import event_queue_size, gossip_subscribers_total
 
@@ -11,7 +12,7 @@ if TYPE_CHECKING:
     from ..bridge import BlockchainEventBridge
 
 
-logger = logging.getLogger(__name__)
+logger = get_logger(__name__)
 
 
 class BlockEventSubscriber: