Adds automated test coverage for Indian electronic invoicing when exports are made without a Letter of Undertaking and prices include tax. This helps ensure invoice totals and taxable base amounts remain consistent, reducing the risk of incorrect compliance reporting.

Add test for export without LUT and price included tax, but base should be equal to invoice total.

Forward-Port-Of: odoo/odoo#231943
Forward-Port-Of: odoo/odoo#231614