Add ability to bulk update products for product managers

I forgot to do this in #12328 [BUU] Remove Stimulus Reflex from Products screen

app/models/spree/ability.rb

@@ -192,7 +192,7 @@ def add_product_management_abilities(user)
         OpenFoodNetwork::Permissions.new(user).managed_product_enterprises.include? product.supplier
       end
 
-      can [:admin, :index], :products_v3
+      can [:admin, :index, :bulk_update], :products_v3
 
       can [:create], Spree::Variant
       can [:admin, :index, :read, :edit,

spec/system/admin/products_v3/products_spec.rb

@@ -150,7 +150,6 @@
           fill_in "Name", with: "Pommes"
         end
 
-        pending "#12403"
         expect {
           click_button "Save changes"
 
@@ -179,14 +178,14 @@
         search_by_category "Category 1"
 
         # expect(page).to have_content "1 product found for your search criteria."
-        expect(page).to have_select "category_id", selected: "Category 1"
+        expect(page).to have_select "category_id", selected: "Category 1" # fails in dev but not CI
         expect_products_count_to_be 1
         expect(page).to have_field "Name", with: product_by_category.name
       end
     end
   end
 
-  xdescribe "updating" do # pending #12403
+  describe "updating" do
     let!(:variant_a1) {
       product_a.variants.first.tap{ |v|
         v.update! display_name: "Medium box", sku: "APL-01", price: 5.25, on_hand: 5,