test: Add test for disallowing setting tandard fields
test: Add test for disallowing setting tandard fields

Via https://github.com/frappe/frappe/pull/14918/commits/db008020f69408a1ce278a311645fb861b5a78d7

almeidapaulopt/frappe,frappe/frappe,frappe/frappe,StrellaGroup/frappe,yashodhank/frappe,mhbu50/frappe,yashodhank/frappe,almeidapaulopt/frappe,mhbu50/frappe,mhbu50/frappe,StrellaGroup/frappe,frappe/frappe,yashodhank/frappe,yashodhank/frappe,mhbu50/frappe,almeidapaulopt/frappe,StrellaGroup/frappe,almeidapaulopt/frappe