[FIX] mrp: do not lose done quantities when updating the quantity to do of a MO

Suppose you have a workorder to create n units of product P,
using raw material R (suppose we use one for one, the following can be extended
to any number of raw materials and factors in a straightforward manner).

Produce j < n units of P. Next, update the quantity to produce to j < k < n.
Since any number m of units between j and n may already have been reserved,
in particular values such that m > k, the move will unreserve the material R.
However, while doing so it will unlink the move_lines, and lose the
quantity_done (j).
The newly created move lines have a quantity_done of zero by default.

Therefore, we store in a dictionary the quantities done for each move line,
and reset these values once the unreservation/reservation of k units is done.

opw 1911969

closes odoo/odoo#28990

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