Remove split checkout toggle and legacy checkout

.rubocop_todo.yml

@@ -628,11 +628,16 @@ Metrics/BlockLength:
     - 'spec/factories/user_factory.rb'
     - 'spec/factories/variant_factory.rb'
     - 'spec/requests/api/orders_spec.rb'
+    - 'spec/requests/checkout/failed_checkout_spec.rb'
+    - 'spec/requests/checkout/stripe_sca_spec.rb'
     - 'spec/support/cancan_helper.rb'
     - 'spec/support/matchers/select2_matchers.rb'
     - 'spec/support/matchers/table_matchers.rb'
     - 'spec/swagger_helper.rb'
     - 'spec/system/consumer/shopping/checkout_spec.rb'
+    - 'spec/system/consumer/shopping/checkout_stripe_spec.rb'
+    - 'spec/system/consumer/shopping/variant_overrides_spec.rb'
+    - 'spec/system/consumer/split_checkout_tax_not_incl_spec.rb'
 
 # Offense count: 1
 # Configuration parameters: CountBlocks, Max.

app/controllers/concerns/order_stock_check.rb

@@ -13,8 +13,6 @@ def valid_order_line_items?
   def handle_insufficient_stock
     return if sufficient_stock?
 
-    reset_order_to_cart
-
     flash[:error] = Spree.t(:inventory_error_flash_for_insufficient_quantity)
     redirect_to main_app.cart_path
   end
@@ -43,10 +41,4 @@ def check_order_cycle_expiry
   def sufficient_stock?
     @sufficient_stock ||= @order.insufficient_stock_lines.blank?
   end
-
-  def reset_order_to_cart
-    return if OpenFoodNetwork::FeatureToggle.enabled? :split_checkout, spree_current_user
-
-    OrderCheckoutRestart.new(@order).call
-  end
 end

app/controllers/payment_gateways/paypal_controller.rb

@@ -29,11 +29,11 @@ def express
           flash[:error] =
             Spree.t('flash.generic_error', scope: 'paypal',
                                            reasons: pp_response.errors.map(&:long_message).join(" "))
-          redirect_to main_app.checkout_state_path(:payment)
+          redirect_to main_app.checkout_step_path(:payment)
         end
       rescue SocketError
         flash[:error] = Spree.t('flash.connection_failed', scope: 'paypal')
-        redirect_to main_app.checkout_state_path(:payment)
+        redirect_to main_app.checkout_step_path(:payment)
       end
     end
 

app/controllers/spree/orders_controller.rb

@@ -78,7 +78,7 @@ def update
           format.html do
             if params.key?(:checkout)
               @order.next_transition.run_callbacks if @order.cart?
-              redirect_to main_app.checkout_state_path(@order.checkout_steps.first)
+              redirect_to main_app.checkout_step_path(@order.checkout_steps.first)
             elsif @order.complete?
               redirect_to main_app.order_path(@order)
             else