Implement group_filter for LDAP integration
Zendesk issue: https://gitlab.zendesk.com/agent/tickets/16230
In some LDAP systems users and groups appear within the same OU structure. In this case, when configuring a
group_base and trying to link LDAP groups in the UI, both users and groups show in the autocomplete field. Supporting a
group_filter option in configuration would allow administrators to set a filter such as
cc/ @JobV I don't think this would be too complicated. Please schedule if you think it sounds like a good idea.