As part of cleanup from 1ES PT conversion, we should examine whether the CodeQL template we provide is still necessary or we can just direct to the 1ES path.

Add official copy of the Arcade templates that is compatible with 1ES… #14525 (comment)

Consider removing SDLValidationParameters - https://github.com/dotnet/arcade/pull/14525/files#r1508020331

Validate whether setup-maestro-vars.yml is any use. I think its usefulness died with the addition of --default-channels in add-build-to-channel