Create a YAML for a true unofficial internal pipeline. The unofficial pipeline mirrors the prod one, and can be used to create arcades for dev work in other repos. Note: After the arcade change to restrict channel publishing goes into effect, it won't be possible to use the non-prod pipeline to publish to anything but the "General*" channels

To double check:

• The right tests are in and the right validation has happened. Guidance: https://github.com/dotnet/arcade/blob/main/Documentation/Validation.md