Resolve ILLink warnings in System.Reflection.DispatchProxy (#46715)

Resolve ILLink warnings in System.Reflection.DispatchProxy (#46715)

* Resolve ILLink warnings in System.Reflection.DispatchProxy

I also took this chance to remove unnecessary GetTypeInfo() calls, since some of them needed to be removed.

Contributes to #45623

* Update annotations for PR feedback.

Remove DynamicallyAccessedMemberTypes.All from the interface and base class types. If unused members are trimmed, this won't cause problems with DispatchProxy.

* Add a trimming test for DispatchProxy since we are suppressing ILLinker warnings.