Update activity for sample application

[tirthdoshi009]

The sample application was not receiving a response when we ran agentsplayground. This change makes sure that when we run the agentsplayground, we can get responses from the agent directly on the window of agentsplayground.

Testing:

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[Copilot]

Pull request overview

This PR updates the activity handlers in the Python Agent Framework sample to fix agents playground connectivity issues. The changes add an installation update handler and enhance logging throughout the message processing flow.

Key changes:

• Added installationUpdate activity handler with welcome message
• Enhanced logging with emojis for better debugging (processing, validation, response sending)
• Added request body logging at the server entry point

[Copilot]

Critical: The auth_handlers parameter was removed from the message activity handler. This breaks authentication for the agents playground.

The on_message handler at line 170 should include auth_handlers=handler to ensure proper authentication:

@self.agent_app.activity("message", auth_handlers=handler)

Comparing with line 154 (installationUpdate) and the similar implementation in python/openai/sample-agent/host_agent_server.py:114, all activity handlers should include the auth_handlers parameter. The removal of this parameter is likely causing the playground connectivity issue mentioned in the PR description.

Suggested change

	@self.agent_app.activity("message")
	@self.agent_app.activity("message", auth_handlers=handler)

[rahuldevikar761]

@tirthdoshi009 can you address this?