Consider bringing back "unlikely to service" packages so that we have a place to build them

[ericstj]

Here's an interesting case for maintenance-packages: dotnet/runtime#54341

Right now we don't build many of these packages any more because they no longer contain serviceable implementations - just facades / not-supported assemblies / reference assemblies. We could bring them back in maintenance-packages just to keep them building and update dependencies.

I think for this to be worthwhile we'd need to do it holistically and have enough customer value in doing so to warrant the work.

[carlossanlop]

From dotnet/runtime#54341 :

• System.Security.AccessControl

From #42 :

• System.IO.FileSystem.AccessControl
• System.IO.Pipes.AccessControl
• System.Reflection.TypeExtensions

[carlossanlop]

From #183

We might have to migrate System.ValueTuple after all.