feat(): sync cart translation synced (#14226)

ref: https://github.com/medusajs/medusa/pull/14189

  **Summary**

  This PR extends the translation module to support automatic translation syncing for cart line items based on the cart's locale.

  Key changes:
  - Added locale field to the Cart model to store the cart's locale preference
  - Created new workflow steps:
    - getTranslatedLineItemsStep - Translates line items when adding to cart or creating a cart
    - updateCartItemsTranslationsStep - Re-translates all cart items when the cart's locale changes
  - Integrated translation logic into cart workflows:
    - createCartWorkflow - Applies translations to initial line items
    - addToCartWorkflow - Applies translations when adding new items
    - updateCartWorkflow - Re-translates all items when locale_code is updated
    - refreshCartItemsWorkflow - Maintains translations during cart refresh
  - Added applyTranslationsToItems utility to map variant/product/type/collection translations to line item fields (title, subtitle, description, etc.)

integration-tests/modules/__tests__/cart/store/cart.workflows.spec.ts

@@ -1360,6 +1360,7 @@ medusaIntegrationTestRunner({
               id: expect.stringContaining("cart_"),
               sales_channel_id: expect.stringContaining("sc_"),
               currency_code: "usd",
+              locale: null,
               region_id: expect.stringContaining("reg_"),
               shipping_address: null,
               item_total: 0,