[FIX] event_sale: make action_confirm work with multi
[FIX] event_sale: make action_confirm work with multi

The other overrides are working with multiple records but not event_sale.
The ensure_one() is not needed if you make a proper loop

Replaces and closes #26078

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo