Fixes to:  https://github.com/odoo/odoo/pull/94406
backported from its fw-port:  https://github.com/odoo/odoo/pull/95176



1) The test for reverse charge should only consider tags for
its country (Italy)
2) The report template shouldn't change its structure, even
if one field is not shown.
3) (enterprise) Mexican invoice template should target the note by
name and not by t-if condition

closes odoo/odoo#95244

Related: odoo/enterprise#29088
Signed-off-by: Florian Gilbert (flg) <flg@odoo.com>