This update adds a new wizard dialog in the Point of Sale system that requires users to select a refund reason when processing refunds for invoices or receipts in Peru. This ensures compliance with Peru's electronic invoicing requirements by capturing the specific reason for each refund (such as "Operation Cancellation"). The system now enforces that refunds are processed one invoice at a time, improving accuracy and regulatory compliance.

This PR adds a wizard in the POS to select a `l10n_pe_edi_refund_reason` when refunding an invoice/boleta (e.g. "Anulación de la operación", "Anulación de la operación"...).

NB: according to PO feedback, it is not possible to refund several invoices/boletas at once (but it is possible to refund one invoice/boleta with multiple credit notes).

task-3801234

https://github.com/odoo/odoo/pull/169597