SAML userGroups namespace

At the LPD-46627: Enhancing SAML to be able to Sync User GroupsClosed story we modified the SAML userGroups membership management according to the portal’s standard way. With that we introduced a namespace for the attribute which seems causing inconveniences to customers, described in the LPD-66611: userGroups Attribute Name Changed to membership:userGroups, Breaking Liferay IdP IntegrationsClosed bug ticket.