[Bug]: Can't turn off streaming for some agents

[Tylersuard]

Describe the bug

When I turn on streaming, all agents stream to the frontend. I have to write my own agent custom agent classes to disable this. I only want my last agent to stream to the frontend. This should be controlled by setting silent=True when setting up an agent.

Steps to reproduce

Run this notebook:
https://ag2ai.github.io/ag2/docs/notebooks/agentchat_websockets#testing-websockets-server-with-python-client

And set any of the agents as silent=True. The agent will still send info to the frontend.

Model Used

No response

Expected Behavior

No response

Screenshots and logs

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Additional Information

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[qingyun-wu]

@davorrunje could you take a look at this issue? thank you!