[entity] Stop returning source information in cw_metainformation() We should not need that. It has been introduced to handle things we should not do and probably don't do anymore (e.g. attempting to grasp recursive import of several sites). Related to #15538288.

[json] Stop serializing cw_source into default json representation of an entity Related to #15538288

Drop deprecated LDAP related script both are relying on the 'entities.source' column which has been dropped in 3.19. They have been written with the old ldapsource in mind, which has been dropped at that time.