Display presence of variant link in UI

It's quite ugly. But we will be iterating on this later.

app/views/admin/products_v3/_variant_row.html.haml

@@ -2,6 +2,8 @@
 - method_on_demand, method_on_hand = variant.new_record? ? [:on_demand_desired, :on_hand_desired ]: [:on_demand, :on_hand]
 %td.col-image
   -# empty
+  - variant.source_variants.each do |source_variant|
+    = content_tag(:span, "🔗", title: t('admin.products_page.variant_row.sourced_from', source_name: source_variant.name, source_id: source_variant.id))
 %td.col-name.field.naked_inputs
   = f.hidden_field :id
   = f.text_field :display_name, 'aria-label': t('admin.products_page.columns.name'), placeholder: variant.product.name

config/locales/en.yml

@@ -720,6 +720,8 @@ en:
         create_sourced_variant: Create sourced variant
       image:
         edit: Edit
+      variant_row:
+        sourced_from: "Sourced from: %{source_name} (%{source_id})"
       product_preview:
         product_preview: Product preview
         shop_tab: Shop

spec/system/admin/products_v3/actions_spec.rb

@@ -315,6 +315,8 @@ RSpec.describe 'As an enterprise user, I can perform actions on the products scr
           within "table.products" do
             # There are now two copies
             expect(all_input_values).to match /My friends box.*My friends box/
+            # One of them is designated as a source variant
+            expect(page).to have_content "🔗"
           end
         end
       end