[FIX] sale_mrp: Link to MO on SO

commit 96b56ea3 fix the link between SO <-> MO in manufacture 3 steps
but break it on other configuration

It happens because without `store after manufacturing` the procurement
group is not copied and used on the MO. And the stat button search on
procurement group with a MO and a SO on it. Before it was searching
on `stock_move.created_production_id` and thus was able to find the MO.

This commit do a mix of the 2 solutions. It search for procurement group
linked to SO and MO + created_production_id to be sure to find all the
MO related to a SO

opw-2645042

closes odoo/odoo#79015

Signed-off-by: William Henrotin (whe) <whe@odoo.com>