Remove OrderStockLocations

These are no longer functional since the introduction of
Stock::SimpleCoordinator. They have not been creatable by admins since
Solidus 2.2.

core/app/models/spree/order.rb

@@ -80,8 +80,6 @@ def states
         pluck(:state).uniq
       end
     end
-    has_many :order_stock_locations, class_name: "Spree::OrderStockLocation"
-    has_many :stock_locations, through: :order_stock_locations
 
     # Adjustments and promotions
     has_many :adjustments, -> { order(:created_at) }, as: :adjustable, inverse_of: :adjustable, dependent: :destroy

core/app/models/spree/order_shipping.rb

@@ -72,18 +72,13 @@ def ship(inventory_units:, stock_location:, address:, shipping_method:,
     end
 
     send_shipment_emails(carton) if stock_location.fulfillable? && !suppress_mailer # e.g. digital gift cards that aren't actually shipped
-    fulfill_order_stock_locations(stock_location)
     @order.recalculate
 
     carton
   end
 
   private
 
-  def fulfill_order_stock_locations(stock_location)
-    Spree::OrderStockLocation.fulfill_for_order_with_stock_location(@order, stock_location)
-  end
-
   def send_shipment_emails(carton)
     carton.orders.each do |order|
       Spree::Config.carton_shipped_email_class.shipped_email(order: order, carton: carton).deliver_later

core/spec/models/spree/shipment_spec.rb

@@ -525,14 +525,6 @@
           allow(shipment).to receive_messages(require_inventory: false, update_order: true, state: state)
         end
 
-        it "should call fulfill_order_with_stock_location" do
-          expect(Spree::OrderStockLocation).to(
-            receive(:fulfill_for_order_with_stock_location).
-            with(order, stock_location)
-          )
-          shipment.ship!
-        end
-
         it "finalizes adjustments" do
           shipment.adjustments.each do |adjustment|
             expect(adjustment).to receive(:finalize!)