[FIX] point_of_sale: recover unpaid orders

Steps to reproduce:

Open a POS session and add an order with a few items on it, but
don't submit a payment for that order.
Exit, close and validate/post the POS session
Open another POS session

Current behavior:

The unpaid order vanished into Never Never Land, never to be
found again.

Expected behavior:

Either an error should be displayed when trying to close a
session with outstanding orders, or any open orders should
be automatically moved to the next open session. If I had
the choice, I would much prefer the second option, plus a
warning message when closing the session.

Closes https://github.com/odoo/odoo/issues/16151

TAK-ID: 1918354

closes odoo/odoo#33395

Signed-off-by: pimodoo <pimodoo@users.noreply.github.com>

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