LPS-42403 Fixed. Now finds all assets from all accesible sites
LPS-42403 Add a method to retrieve the descendants of a group

See OrganizationImpl.getDescendats.
LPS-42403 Add a method to obtain the groupIds of all sites sharing content
LPS-42403 Add Test
LPS-42403 Regen
LPS-42403 SF
LPS-42403 Auto SF
LPS-42403 SF
LPS-42403 SF