Fix sample data in v2 by setting a Default shipping category in both products and shipping methods

lib/tasks/sample_data/product_factory.rb

@@ -74,8 +74,8 @@ class ProductFactory
       variant_unit: "weight",
       variant_unit_scale: 1,
       unit_value: 1,
-      on_demand: true
+      on_demand: true,
+      shipping_category: Spree::ShippingCategory.find_or_create_by_name('Default')
     )
-    Spree::Product.create_with(params).find_or_create_by_name!(params[:name])
   end
 end

lib/tasks/sample_data/shipping_method_factory.rb

@@ -48,6 +48,7 @@ class ShippingMethodFactory
     params[:distributor_ids] = [enterprise.id]
     method = enterprise.shipping_methods.new(params)
     method.zone = zone
+    method.shipping_categories << Spree::ShippingCategory.find_or_create_by_name('Default')
     method.save!
     method
   end