[FIX] stock: allow to validate a picking with 2 extra moves

Use case to reproduce:
- Create a picking containing 2 moves that have a quantity_done greater than reserved quantity
- Validate the picking with or without backorder

Traceback due to a record that do not exist anymore.

It happens due to 2 functionality that have a wrong behavior when used together:
- merge_move function that will try to merge moves with same characteristics inside a same picking.
- action_done functionality that will create an extra move if the quantity done for a move is greater
than reserved quantity. (the extra move is used in order to propagate changes)

With our usecase:
- MOVE A, reserved_qty: 10, qty_done: 20
- MOVE B, reserved_qty: 10, qty_done: 15
action_done on move A will create a new move thus we will have
- MOVE A, reserved_qty: 10, qty_done: 20
-  A bis, reserved_qty: 10, qty_done: 0
- MOVE B, reserved_qty: 10, qty_done: 15
then merge move will not only merge move A and A bis but will also merge B
which result with inconsenstencies and traceback since system will try to
process move B after A
- MOVE A,A',B reserved_qty:30, qty_done:35 (the 5 extra qty is not propagated)

This commit adds a kwarg in action_confirm that is propagated to merge_move
this kwargs is a record set taht will limit the moves that can be used for the merge
in order to merge extra move in original move

opw-1825264