fixed lint issue

Author: AjitPadhi-Microsoft

src/backend/v3/orchestration/orchestration_manager.py

@@ -5,7 +5,6 @@
 import uuid
 from typing import List, Optional
 
-from azure.identity import DefaultAzureCredential as SyncDefaultAzureCredential
 from common.config.app_config import config
 from common.models.messages_kernel import TeamConfiguration
 from semantic_kernel.agents.orchestration.magentic import MagenticOrchestration