[FIX] website_sale: fix concurrent update

Since forward-port, `/sale/get_combination_info_website` and `_cart_update`
would lead to a concurrency error.

Indeed, the session would not have an order_id at first. Then both rpc would
be sent at the same time:
- `cart_update` would create an order and add it in the session
- `/sale/get_combination_info_website` would end up calling `_compute_cart_qty`
which would call `sale_get_order` and would set the `sale_order_id` to none,
just aftet the `_compute_cart_qty` would actually add an order in the
session, simultaneously.

closes odoo/odoo#33993

Signed-off-by: Christophe Simonis <chs@odoo.com>


Co-authored-by: Romain Derie <rde@odoo.com>
Co-authored-by: Christophe Simonis <chs@odoo.com>
Co-authored-by: Sébastien Theys <seb@odoo.com>

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