TeamTool fails to execute twice for one Agent

### What happened?

**Describe the bug**
It seems that Autogen has troubles calling TeamTool twice for one Agent. First execution completes, but second is failing due to team that is already running.

**To Reproduce**
Following snippet will reproduce bug. Just replace LLM config with yours.

```python
import asyncio

from autogen_agentchat.agents import AssistantAgent
from autogen_agentchat.conditions import SourceMatchTermination
from autogen_agentchat.tools import TeamTool
from autogen_agentchat.teams import RoundRobinGroupChat
from autogen_agentchat.ui import Console
from autogen_ext.models.openai import AzureOpenAIChatCompletionClient

default_model_client = AzureOpenAIChatCompletionClient(
            azure_endpoint=default_llm_model.azure_endpoint,
            api_version=default_llm_model.api_version,
            azure_deployment=default_llm_model.azure_deployment,
            model=default_llm_model.model,
            api_key=default_llm_model.api_key,
        )

async def main() -> None:
    model_client = default_model_client

    writer = AssistantAgent(name="writer", model_client=model_client, system_message="You are a helpful assistant.")
    reviewer = AssistantAgent(name="reviewer", model_client=model_client, system_message="You are a critical reviewer.")
    summarizer = AssistantAgent(
        name="summarizer",
        model_client=model_client,
        system_message="You combine the review and produce a revised response.",
    )
    team = RoundRobinGroupChat(
        [writer, reviewer, summarizer], termination_condition=SourceMatchTermination(sources=["summarizer"])
    )

    # Create a TeamTool that uses the team to run tasks, returning the last message as the result.
    tool = TeamTool(
        team=team, name="writing_team", description="A tool for writing tasks.", return_value_as_last_message=True
    )

    main_agent = AssistantAgent(
        name="main_agent",
        model_client=model_client,
        system_message="You are a helpful assistant that can use the writing tool.",
        tools=[tool],
    )
    # For handling each events manually.
    # async for message in main_agent.run_stream(
    #     task="Write a short story about a robot learning to love.",
    # ):
    #     print(message)
    # Use Console to display the messages in a more readable format.
    await Console(
        main_agent.run_stream(
            task="Write a two short stories about a robot learning to love.",
        )
    )


if __name__ == "__main__":
    import asyncio

    asyncio.run(main())
```

Part of console output:
```text
---------- ToolCallRequestEvent (main_agent) ----------
[FunctionCall(id='call_6zLWv0PuEG8KzKqnku4JT27t', arguments='{"task": "Write a short story about a robot learning to love."}', name='writing_team'), FunctionCall(id='call_nnUcVQJjHF9GTwZCdIDyTLkz', arguments='{"task": "Write another short story about a robot learning to love."}', name='writing_team')]

... team tool output ...

---------- ToolCallExecutionEvent (main_agent) ----------
[FunctionExecutionResult(content='Years passed in Neo-Luna[...]', name='writing_team', call_id='call_6zLWv0PuEG8KzKqnku4JT27t', is_error=False), 


FunctionExecutionResult(content='The team is already running, it cannot run again until it is stopped.', name='writing_team', call_id='call_nnUcVQJjHF9GTwZCdIDyTLkz', is_error=True)]
```

Full console output:
[team-tool-bug-console.txt](https://github.com/user-attachments/files/21530363/team-tool-bug-console.txt)

**Expected behavior**
Two stories are printed in Console, no `The team is already running, it cannot run again until it is stopped.` error reported.

**Additional context**
Snippet were taken from this [official documentation](https://microsoft.github.io/autogen/stable/reference/python/autogen_agentchat.tools.html#autogen_agentchat.tools.TeamTool), I've just modified user prompt to include two stories, instead of one.

### Which packages was the bug in?

Python AgentChat (autogen-agentchat>=0.4.0)

### AutoGen library version.

Python 0.7.1 (but it also occurred in 0.6.1 as well)

### Other library version.

_No response_

### Model used

gpt-4o-2024-05-13

### Model provider

Azure OpenAI

### Other model provider

_No response_

### Python version

3.13

### .NET version

None

### Operating system

Windows

Labels: needs-triage
State: closed