A JSON array of all user groups available for the current client. Contains JSONObjects with the
following key-value pairs:
id (string): The ID of the user group, i.e. the UUID, prefixed with [!] for the inverse
condition.
name (string): The name of the user group.
altId (string): The legacy ID of the user group, i.e. the name of the user group, prefixed with
[!] for the inverse condition. This is deprecated, use id instead.