UsingToolVisualStudioIbcTraining is not defaulted to false in the outer ArPow builds. It gets correctly set to false in the inner build.

https://github.com/dotnet/arcade/blob/main/src/Microsoft.DotNet.Arcade.Sdk/tools/DefaultVersions.props#L69

This causes issues w/repos (e.g. msbuild) that turn on UsingToolVisualStudioIbcTraining.