Description
As discussed in #23786 (comment), we have an opportunity to remove use of NuGet.exe when wrapping our shared framework and targeting packs into *.nupkg files. Separate *.csproj projects that depend only on the SharedFramework.wixproj or TargetingPack.wixproj could work like other C# projects with custom *.nuspec files. It would mean two more projects and four more project invocations (one for each Windows $(Platform) per project) but removes a download.
Note that since the new C# projects would depend only on WiX projects, they'd need to run in desktop msbuild. Complicating things with a switch back to dotnet msbuild and discovery of the *.msi files et cetera doesn't seem worthwhile. That is, let's do this as long as it's a simplification.
(Putting this on the aspnet-build project and not the DoI one because this infrastructure directly affects few devs.)
/cc @dotnet/aspnet-build