Description of the issue/feature this PR addresses:

A user without accounting rights cannot open an invoice form when l10n_es_edi_verifactu is installed.

The module adds a VeriFactu page and three warning banners to the standard invoice form without any groups restriction, so every user able to open an invoice reads three fields (l10n_es_edi_verifactu_document_ids, l10n_es_edi_verifactu_warning, l10n_es_edi_verifactu_warning_level) pointing at l10n_es_edi_verifactu.document.

That model only grants read access to account.group_account_invoice and account.group_account_readonly.

Steps to reproduce:
- install `l10n_es_edi_verifactu`
- create a salesman user with sales rights but no accounting right (*Own Documents Only* is enough)
- create an ES company and an ES customer
- give the salesman access to the ES company
- activate Peppol in the general settings
- log in as the salesman
- create a sale order in the ES company for the ES customer
- confirm it
- click **Create Invoice**
- click **Create Draft**

Current behavior before PR:

An error access is raised:

Failed to read field account.move.l10n_es_edi_verifactu_document_ids

You are not allowed to access 'Veri*Factu Document' (l10n_es_edi_verifactu.document) records.

This operation is allowed for the following groups:
	- Invoicing/Billing
	- Technical/Show Accounting Features - Readonly

Contact your administrator to request access if necessary.


In Odoo sh (for databases 19.0), the standard test sale_management / TestSaleFlowTourPostInstall.test_basic_sale_flow_with_minimal_access_rights fails  for the same reason as soon as l10n_es_edi_verifactu is installed alongside sale_management.

Desired behavior after PR is merged:

On a database with l10n_es_edi_verifactu installed, a non-accountant user having the possibility to create invoices should not have the error message displayed.


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Forward-Port-Of: odoo/odoo#280879