Prefer types over members in attribute arguments

[xparadoxical]

• Incorrect binding to a property instead of type when property is nullable roslyn#80904
  It makes no sense to bind to a property here, and the resulting error prevents using an enum constant like you'd normally be able to do.

• The error: CS0236 is reported incorrectly on a nullable enum property with same name as enum type.  roslyn#56348
  That's a somewhat similar case, but in a property initializer it's absolutely valid to use a property.

[CyrusNajmabadi]

it makes no sense to bind to anything non-static

This is not true. It's fine to bind to non-static things. That happens in attributes all the time. For example:

[Attr(nameof(param)]
void Foo(int param) {}