[IMP] stock: various optimizations when validating inventory.

Backport of 14.0 PR odoo/odoo#73082 with some slight changes.

Backport of master PR odoo/odoo#62083.

Improve stock.picking._compute_state by computing pickings new state conditions
beforehand. This avoids looping through picking.move_lines for each
condition for each picking.

opw-2613931

closes odoo/odoo#74808

Signed-off-by: William Henrotin <Whenrow@users.noreply.github.com>