[IMP] test_lint, *: add caughtErrors option to no-unused-vars

All named arguments on the catch block must be used. If for some motive
the named argument on the catch block is not used, its name must begin
with '_'.

closes odoo/odoo#85569

Related: odoo/enterprise#24867
Related: odoo/design-themes#552
Signed-off-by: Géry Debongnie <ged@odoo.com>