[Permissions] Update permission set to add/remove specific account roles

Problem statement:

We are trying to create custom Account roles to cater for different support departments in the university. But the 'Admins - Add / Remove' permission isn't fine-tuned enough to allow for customised Account roles that can add other specific Account roles.

Proposed solution:

Similar to the 'Users - Auditors | Designers | Instructors | Students | Tutors (add/remove in subjects)' permission, update the 'Admins - Add / Remove' permission so that specific account roles can be specified. For example, we need an Operational Support role which assists Account Admins. They need to be able to add custom roles (Account) at the sub-account level without having the ability to add Account Admins.

User role(s):

admin