Arcade powered source build is missing validation in arcade or arcade-validation

https://github.com/dotnet/arcade/commit/9a643b7b15a044f249a1d569c1c170b88245a47c had some issues that weren't caught in CI in arcade or arcade-validation. We should add validation so that issues will be identified before promoting bits to the `.NET Eng - Latest` channel.

cc @mmitche

Start by reviewing commit 9a643b7b15a044f249a1d569c1c170b88245a47c and the validation paths in arcade or arcade-validation. Identify the issues that escaped CI and add checks that detect them before bits are promoted to the `.NET Eng - Latest` channel.

Written by the indexing model from the issue text.