Symbol paths are wrong when building at least locally

[ViktorHofer]

Affects not just msbuild. This is due to the use of AzDO properties here: https://github.com/dotnet/arcade/blob/6bcab7722ffc02d9a9f64e736d06bb4e4a04a94b/src/Microsoft.DotNet.Arcade.Sdk/tools/Publish.proj#L88

[ViktorHofer]

cc @mmitche @jkoritzinsky

[mmitche]

Yep. We should have reasonable defaults (or just eliminate these path elements altogether) if they are not available in a dev build.