Always build App.Ref and the targeting packs (#39568)

Directory.Build.props

Directory.Build.targets

eng/Versions.props

eng/targets/ResolveReferences.targets

...Internal/src/Microsoft.AspNetCore.App.Ref.Internal.csproj

...Framework/App.Ref/src/Microsoft.AspNetCore.App.Ref.csproj

src/Framework/test/Microsoft.AspNetCore.App.UnitTests.csproj

src/Framework/test/TargetingPackTests.cs

src/Installers/Debian/Directory.Build.targets

...tallers/Debian/TargetingPack/Debian.TargetingPack.debproj

src/Installers/Rpm/Directory.Build.targets

src/Installers/Rpm/TargetingPack/Rpm.TargetingPack.rpmproj

src/Installers/Windows/TargetingPack/TargetingPack.wixproj

src/SiteExtensions/LoggingBranch/LB.csproj