Add support for learn param/command to Az MCP CLI

[g2vinay]

Add support for --learn command in Az MCP CLI.
Needed for AI Agents Adoption.

[github-actions]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @alzimmermsft @anannya03 @anuchandy @g2vinay @microsoft/azure-mcp @xiangyan99.