[FIX] stock: remove superfluous track visibility messages

`_run_move` creates the move, calls `_assign_picking` and then confirms it. The
result is that a draft move is added to a picking and then its state is changed to
confirmed. As the state of the picking is computed across its moves and a manual
call to `message_track` is done when any of its move changes its state, there was
a lot of tracking messages in the picking chatter, especially when you confirm a sale
order (a lot of calls to _run_move).

The thing is that this is unnecessary as stock.move’s `_action_confirm` will call
`_assign_picking` later on AND after having changed its state to “confirmed”. Now
a confirmed move is added to a confirmed picking and no message are posted. This
improves considerably the validation of a massive SO.

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