[FIX] base: suggested default ACL should be safer
[FIX] base: suggested default ACL should be safer

When there is no ACL for a model, the system emits a log with a sample
ACL entry that developers should consider adding. This proposed ACL
should be safe: a default read-only access for internal users
seems appropriate.

Closes #25919

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo