Ensure guest users are disabled for Azure Role Assignment

Azure Role Assignment has guest users added, this can impact the integrity and confidentiality of data.

In Azure Console -

1. Open the Azure Portal and go to Active Directory.
2. Select the user you wish to edit.
3. Under Manage, select Assigned roles.
4. Remove any assignment for the Guest role.

In Terraform -

1. In the azurerm_role_assignment resource, update the role_definition_name to something other than Guest.

References:
https://learn.microsoft.com/en-us/azure/role-based-access-control/built-in-roles
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/role_assignment