[FIX] product_expiry: set the expiration_date when creating the “stock_move_line”

Steps to reproduce the bug:
- Install inventory, purchase and product_expiry
- Create a new storable product that is tracked by lots or serial numbers and expiration date
- Go to inventory > configuration > Warehouse Management > Operations Types
- In “San Francisco: Receipts” > Enable "Create New Lots/Serial Numbers", “Pre-fill Detailed Operations”, and "Show Detailed Operations"
- Create a new RFQ > select the created product > Confirm the order
- Click on “Receipt”

Problem:
In the created “stock_move_line” the expiration date field is not set

Solution:
When we add a new "stock_move_line" and choose a product, an onchange is triggered in order to set
the expiration_date field even if we do not choose a "lot /serial number name".
So we can replace the onchange with a compute function to do the same thing in the creation.

opw-2634583

closes odoo/odoo#75806

Signed-off-by: Arnold Moyaux <amoyaux@users.noreply.github.com>