[dev/arcade-migration] Package content diffs after Arcade migration

[dagood]

I plan to fix these:

Microsoft.NETCore.App.versions.txt no longer has Core-Setup hash, and is missing CoreCLR (in the runtime package txt files).

Commit hash no longer appears in pkgproj nupkg descriptions. (The managed projects now have a repository element containing this information, but pkgproj-based projects don't.)

Microsoft.NETCore.App.Internal (legacy netcoreapp framework package) has some differences in build/netcoreapp3.0/:

• It doesn't include Microsoft.NETCore.App.Internal.props or the platform manifest. With a trivial fix to put these in the nupkg, I see these further diffs:
• PackageConflictPreferredPackages property is now empty (just a ;).
• _Microsoft_NETCore_App_Internal_Version is renamed _Microsoft_NETCore_App_Version
• PackageConflictPlatformManifests points to netcoreapp.PlatformManifest.txt (the original name of the file, not the name it has in the package).
• These are legacy packages used for consumption in tests. This difference doesn't affect Core-Setup's tests. I'm on the fence about fixing it (vs leaving the files out entirely) but I want to reduce the migration risk on CoreCLR and ASP.NET Core.

Shared frameworks:

• WindowsDesktop shared framework has some files with Microsoft.NETCore.App naming that should be Microsoft.WindowsDesktop.App.
• Both shared frameworks include a reference to Microsoft.DotNet.Build.Tasks.Packaging in their deps json files.
• .version file has no commit hash.

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I don't plan to fix these before merging the migration:

Platform manifests have symbol files in them now, in general.

• I believe this is just a little useless data that should be trimmed for size, but has no effect.

[dagood]

Fixed by dotnet/core-setup#7259