Global groups that a user is automatically promoted to if they belong to another group. Array keys are a local or global group, and array values are global groups with automatic membership. The user belongs to a global group if and only if at least one of their other groups promotes them to it. Automatic global groups will only be added in response to groups that were added manually (not via autopromotion). Prerequisites for using this config: the automatic global groups need to be created, and must not have the same name as a local group. Note that automatic global groups will be updated even in response to local groups being updated by a user who does not have the `globalgroupmembership` right.