Remove outdated unit test

There shouldn't be logic that modifies the cartItems inside the getter

src/fmg-components/cart/cart.spec.js

@@ -309,40 +309,6 @@ describe("cart.vue", () => {
             expect(found).toBe(true);
         });
 
-        // Service package discount Fee Cart Item
-        test("only if there is service package discount fee for the package, a service package discount cart item should be added to the cart", () => {
-            // Arrange
-            const lineItems = {
-                glassParts: [],
-                supportingItems: [
-                    {
-                        description: null,
-                        id: "bc00294e-6baa-403e-866e-52c267187a15",
-                        kitPrice: 0,
-                        laborAmount: 0,
-                        partNumber: "DISC CASHSAVE70",
-                        partType: "SERVICE PACKAGE DISCOUNT",
-                        salesTax: null,
-                        sellingPrice: -70,
-                    },
-                ],
-                vaps: [],
-                promos: [],
-            };
-
-            const availableVaps = [];
-
-            // Act
-            const { wrapper } = setupMocks({
-                props: {
-                    modelValue: lineItems,
-                    availableVaps: availableVaps,
-                },
-            });
-            // Assert
-            expect(wrapper.vm.servicePackageDiscountCartItem).toBeNull();
-        });
-
         // Other Supporting Items Cart Item
         test("if there are other supporting items on the order, an other supporting items cart item should be added to the cart but should not be displayed", () => {
             // Arrange