VMR unified build fails on PGO legs: Download from all targets failed

[akoeplinger]

https://dev.azure.com/dnceng/internal/_build/results?buildId=2448099&view=results

    /vmr/src/sdk/src/Installer/redist-installer/targets/GenerateLayout.targets(400,5): error : Download from all targets failed. List of attempted targets: file:///vmr/artifacts/assets/Release/Runtime/9.0.0-preview.5.24256.1/dotnet-runtime-9.0.0-preview.5.24256.1-linux-x64.tar.gz [/vmr/src/sdk/src/Installer/redist-installer/redist-installer.csproj]
    /vmr/src/sdk/src/Installer/redist-installer/targets/GenerateLayout.targets(400,5): error : Failed to download file using addresses in Uri and/or Uris. [/vmr/src/sdk/src/Installer/redist-installer/redist-installer.csproj]

Happens on both Windows and Linux.

/cc @ViktorHofer @jkoritzinsky

[ViktorHofer]

@jkoritzinsky I think it was you who added the PGO legs? Please take a look.