unified-build buildpass=2 job is broken

[ViktorHofer]

Regressed with dotnet/sdk@8823927

https://dev.azure.com/dnceng/internal/_build/results?buildId=2631403&view=results

D:\a_work\1\s\src\sdk\eng\Signing.props(4,5): error MSB4184: The expression "[System.IO.File]::ReadAllText(D:\a_work\1\s\src\sdk\artifacts\tmp\Release\FullNugetVersion.version)" cannot be evaluated. Could not find file 'D:\a_work\1\s\src\sdk\artifacts\tmp\Release\FullNugetVersion.version'. [D:\a_work\1\s\artifacts\source-built-sdks\Microsoft.DotNet.Arcade.Sdk\tools\Publish.proj]