[FIX] mrp,mrp_account,point_of_sale,stock_account: fix COGS entries for invoiced kit

- Activate anglo saxon accounting
- Have a [DEMO] KIT product in a category using automated
Inventory Valuation with costing method AVCO
- The KIT is composed by C1 and C2 in the same product category
- Define a cost on both C1 and C2
- Open a POS session, order [DEMO], Invoice and complete the order
- Close Session, Validate and display Journal Items

COGS entries will be missing.
This does not occur when making the order without invoicing

opw-2481518
opw-2545758

closes odoo/odoo#71509

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