[Feature Request]: Add Pester test to validate `builtInRoleNames` for nested RBAC modules

### Description

Leverage the `utilities\tools\Update-RoleAssignmentList.ps1` utility to validate the list of `builtInRoleNames` for the `nested_roleAssignments` template when the module supports RBAC.

Since the list of valid roles for each resource type changes in Azure, we must be able to track it and validate overtime if the list needs to be updated.