This update enhances the testing process for paying invoices with bank statement lines within the Odoo accounting system. The change introduces a reusable test helper, streamlining testing and ensuring more accurate invoice payment simulations. This improves the reliability of our accounting module's payment functionality.

Forward-Port-Of: odoo/odoo#244377
Forward-Port-Of: odoo/odoo#244281

This update organizes UBL test files for better compatibility with future move formats and improved schema validation. The change improves the structure of test data, streamlining development and testing processes related to UBL invoice generation.

This commit rearranges the UBL test files' subfolder to be one level higher, from `export/bis3/be` to `export/bis3/invoice/be`, in preparation for supporting different move formats and for better ignore schema support.

task-4891206

Forward-Port-Of: odoo/odoo#244665