[FIX] website_sale: correctly handle no_variant attributes on reorder

New "Re-order from portal" feature for e-commerce orders was not
considering specified no_variant & custom information on the order at all.

This commit makes sure the information is correctly forwarded to the cart,
ensuring the reordered products are the same as the ones previously ordered.

opw-3380312

Part-of: odoo/odoo#123555
Co-authored-by: Florent de Labarre <florent.mirieu@gmail.com>