Attempts to push build asset information to Maestro started failing
recently:
D:\a\1\s\xamarin-macios\packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21212.6\tools\SdkTasks\PublishBuildAssets.proj(43,5): error MSB4062: The "PushMetadataToBuildAssetRegistry" task could not be loaded from the assembly C:\Users\VssAdministrator\.nuget\packages\microsoft.dotnet.maestro.tasks\1.1.0-beta.20570.1\tools\netcoreapp3.1\Microsoft.DotNet.Maestro.Tasks.dll. Could not load file or assembly 'C:\Users\VssAdministrator\.nuget\packages\microsoft.dotnet.maestro.tasks\1.1.0-beta.20570.1\tools\netcoreapp3.1\Microsoft.DotNet.Maestro.Tasks.dll'. The system cannot find the path specified.
Commit a1d0b6eb looks like it may have broken this, as it changed the
`globalPackagesFolder` used for NuGet packages across the repo.
Looking at [PublishBuildAssets.proj][0] we should be able to set the
`$(NuGetPackageRoot)` property to the new `globalPackagesFolder` value,
fixing attempts to load `Microsoft.DotNet.Maestro.Tasks.dll`.
[0]: b8007eed82/src/Microsoft.DotNet.Arcade.Sdk/tools/SdkTasks/PublishBuildAssets.proj (L32)
e39e8e3655