fix: remove unused Agent import (F401)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Dhanushree-Microsoft

src/processor/src/libs/agent_framework/groupchat_orchestrator.py

@@ -22,7 +22,6 @@
 from typing import Any, Awaitable, Callable, Generic, Mapping, TypeVar
 
 from agent_framework import (
-    Agent,
     AgentResponseUpdate,
     Executor,
     Message,