Add JWT decoding to agentic message handling

[MattB-msft]

This pull request updates the AgenticAI agent in test-agents/agentic-ai/src/index.ts to enhance the handling and display of user authentication token details. The main changes focus on decoding JWT tokens to extract user information and simplifying activity handler registration.

Authentication and user info extraction:

• Added JWT decoding using the jsonwebtoken library to extract user details (name, upn, oid, tid) from the authentication token in the agentic handler, and included these details in the bot's response message. [1] [2]

Activity handler registration simplification:

• Removed unused parameters (true/false for useToken) from the onActivity method calls for both agentic and echo handlers, streamlining the activity registration logic.

[Copilot]

Pull request overview

This pull request enhances the AgenticAI test agent to display decoded JWT user information from authentication tokens. The changes introduce JWT decoding capabilities and simplify the activity handler registration by removing an unused parameter.

Changes:

• Added JWT decoding to extract user claims (name, upn, oid, tid) from authentication tokens
• Simplified activity handler registration by removing the isAgenticRoute boolean parameter from onActivity calls

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