[Orders] When a product name is changed, order editing page and customer view are showing new name instead of old one

Description

Follow-up from https://github.com/openfoodfoundation/openfoodnetwork/pull/13261 which you can have a look at to replicate the solution

Orders should not change once they are created, so if a shopper buys "Pasta!" and the producer decides the new name is "Pasta!renewed", the order content should never change and remain what the shopper has chosen.

Expected Behavior

Orders content should not change: they should display line items, not products.

Actual Behaviour

Orders are showing the new product name.

Steps to Reproduce

1. Place an order for a product
2. Edit the name of the product in admin/products
3. See that the name has changed in admin/orders/ORDERNUMBER/edit and /orders/ORDERNUMBER

Animated Gif/Screenshot

<img width="1024" height="552" alt="Image" src="https://github.com/user-attachments/assets/22f79f7b-1198-42dc-a35e-2ea19125e42d" /> <img width="1338" height="839" alt="Image" src="https://github.com/user-attachments/assets/4f8fa9e0-2571-4c8d-9574-664f886065cc" />

Workaround

Hopefully this is rare and/or users know they have changed the name.

Severity

bug-s3: a feature is broken but there is a workaround