Python: Fix GroupChat orchestrator message cleanup issue (#3712)

* Fix GroupChat orchestrator message cleanup issue

Apply clean_conversation_for_handoff to GroupChatOrchestrator and
AgentBasedGroupChatOrchestrator _handle_response methods to remove
tool-related content that causes API errors from empty messages.

Fixes #3705

* Move orchestration related files to orchestrations package.

* Fix imports

---------

Co-authored-by: alliscode <bentho@microsoft.com>
Co-authored-by: Evan Mattson <evan.mattson@microsoft.com>

python/samples/getting_started/workflows/human-in-the-loop/agents_with_approval_requests.py

@@ -3,7 +3,7 @@
 import asyncio
 import json
 from dataclasses import dataclass
-from typing import Annotated, Never
+from typing import Annotated
 
 from agent_framework import (
     AgentExecutorResponse,
@@ -16,6 +16,7 @@ from agent_framework import (
     tool,
 )
 from agent_framework.openai import OpenAIChatClient
+from typing_extensions import Never
 
 """
 Sample: Agents in a workflow with AI functions requiring approval

python/samples/getting_started/workflows/human-in-the-loop/concurrent_request_info.py

@@ -26,15 +26,14 @@ from collections.abc import AsyncIterable
 from typing import Any
 
 from agent_framework import (
-    AgentRequestInfoResponse,
     ChatMessage,
-    ConcurrentBuilder,
     RequestInfoEvent,
     WorkflowEvent,
     WorkflowOutputEvent,
 )
 from agent_framework._workflows._agent_executor import AgentExecutorResponse
 from agent_framework.azure import AzureOpenAIChatClient
+from agent_framework.orchestrations import AgentRequestInfoResponse, ConcurrentBuilder
 from azure.identity import AzureCliCredential
 
 # Store chat client at module level for aggregator access

python/samples/getting_started/workflows/human-in-the-loop/group_chat_request_info.py

@@ -28,14 +28,13 @@ from typing import cast
 
 from agent_framework import (
     AgentExecutorResponse,
-    AgentRequestInfoResponse,
     ChatMessage,
-    GroupChatBuilder,
     RequestInfoEvent,
     WorkflowEvent,
     WorkflowOutputEvent,
 )
 from agent_framework.azure import AzureOpenAIChatClient
+from agent_framework.orchestrations import AgentRequestInfoResponse, GroupChatBuilder
 from azure.identity import AzureCliCredential
 
 

python/samples/getting_started/workflows/human-in-the-loop/sequential_request_info.py

@@ -27,14 +27,13 @@ from typing import cast
 
 from agent_framework import (
     AgentExecutorResponse,
-    AgentRequestInfoResponse,
     ChatMessage,
     RequestInfoEvent,
-    SequentialBuilder,
     WorkflowEvent,
     WorkflowOutputEvent,
 )
 from agent_framework.azure import AzureOpenAIChatClient
+from agent_framework.orchestrations import AgentRequestInfoResponse, SequentialBuilder
 from azure.identity import AzureCliCredential