Expand version checks to include more

[dougbu]

• Include everything we reference from assemblies in Microsoft.AspNetCore.App i.e. don't skip over System.IO.Pipelines or anything else from dotnet/runtime
  • This part is about updating our existing tests of Microsoft.AspNetCore.App.Ref and Microsoft.AspNetCore.App.Runtime.* content
• Check the versions of the assemblies in all shipping packages
  • This part is more complicated because we need to baseline all expected versions from other repos, especially netstandard2.0 assemblies we reference from dotnet/runtime
  • Ignore patch versions of all .NET Framework assemblies and what they reference
  • Confirm w/ dotnet/runtime what assembly versions they plan to update while in 6.0 servicing
  • No need to open anything from other repos i.e. just check our assemblies and their references

[dougbu]

/fyi @dotnet/aspnet-build I combined the testing bits into a single issue at least for now

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