[IMP] stock,mrp,purchase: refactor priority

- MO/picking/PO/stock.move have now the "same" `priority` fields
(Boolean logic: Normal or Urgent).
These models are now sort by priority first. Note that the priority field of
stock move is a technical one.
- For MO and picking, the set of `priority` field change priority of
the related stock move. The prioriry field on stock move is
used by the scheduler for reservation ('Urgent' before 'Normal')
- The Stock Replenishment Report also take in account the priority
to be consistent with the reservation.

task-2246665

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