Don't publish dotnet-sdk-internal installers

[ViktorHofer]

The dotnet-sdk-internal installers (msi & pkg) are meant for VS consumption. They are redistributes inside the VS.Redist.Common.Toolset package and therefore the installer don't need to get published. We should avoid that to save storage.

The work here would mean not generating the installers under ArtifactsNonShippingPackagesDir. Any other directory that doesn't get published is fine.

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.