Remove NonARModels

[kbrock]

Not sure why we need these changes, but they feel unrelated to virtual attributes.

May want to move this into the non-ar backed models.

This is at the top of virtual_fields

      module NonARModels
        def dangerous_attribute_method?(_); false; end
        def generated_association_methods; self; end
        def add_autosave_association_callbacks(*_args); self; end
        def belongs_to_required_by_default; false; end
      end

      included do
        unless respond_to?(:dangerous_attribute_method?)
          extend NonARModels
        end
      end

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