add bulk upload sales 23 nationalbuy2 field

app/services/bulk_upload/sales/year2023/row_parser.rb

@@ -754,6 +754,7 @@ private
 
     attributes["ethnic_group2"] = infer_buyer2_ethnic_group_from_ethnic
     attributes["ethnicbuy2"] = field_40
+    attributes["nationalbuy2"] = field_41
 
     attributes
   end

spec/services/bulk_upload/sales/year2023/row_parser_spec.rb

@@ -643,5 +643,13 @@ RSpec.describe BulkUpload::Sales::Year2023::RowParser do
         expect(parser.log.ethnicbuy2).to be(1)
       end
     end
+
+    describe "#nationalbuy2" do
+      let(:attributes) { setup_section_params.merge({ field_41: "18" }) }
+
+      it "is correctly set" do
+        expect(parser.log.nationalbuy2).to be(18)
+      end
+    end
   end
 end