Pin analyzers that ship in the SDK (#36690) (#36747)

* Pin analyzers that ship in the SDK

ASP.NET Core produces a few analyzer assemblies that are shipped as part of the .NET SDK. These analyzers are added to web projects targeting 3.1 and newer.
In 6.0, we (unintentionally) bumped the version of Microsoft.CodeAnalysis that these projects referenced to a 4.0 version. This causes warnings when opening
a 3.1 or 5.0 app in VS 2019 as it does not support these versions.

Additionally update the version of Microsoft.CodeAnalysis.* packages used in tests, Razor, and framework analyzers that are only expected to run with VS 2020 to a more recent build. This is largely book-keeping, but allows us
to write a test for file scoped namespaces.

Fixes https://github.com/dotnet/aspnetcore/issues/36552