[IMP] stock: propagate orderpoint through moves

Orderpoint reference are only set on the first object that is created
from the procurement request. However sometimes we would like to access
it from further object or define another behavior if we come from an
orderpoint.

Now that the we propagate the orderpoint_id, it's important to ignore
po line with an orderpoint AND a chained stock move, else the quantities
will be counted twice by the orderpoint in a 2 steps receipt scenario

Task: 1849912