[IMP] stock: replenishment using qty from the BoM

The replenishement creation currently calculates the quantity to order
using a default multiple quantity of 1. In case of manufacturing route,
we want to calculate the multiple quantity according to the quantity
produced in the BoMs.

closes odoo/odoo#62766

Signed-off-by: Rémy Voet <ryv-odoo@users.noreply.github.com>