Add missing MCPB instructions to README, TSG, etc

[joshfree]

You can see MCPB is missing from the list above ^

[joshfree]

@vcolin7 please fix this before 2.0 GA

[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.