[IMP] point_of_sale: make pos_session multi company aware
[IMP] point_of_sale: make pos_session multi company aware

When creating a pos session we try to link the session to
the first cash journal we find.

The problem is that we cannot link a journal comming from another
company this is strictly forbidden by a constraint.

This is why we should make sure that we search only for journals in the
same company as the config.

Task 1913733
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo