Use LoggedUpdateMaintenance to create Template

Created by: osnard

Making modifications to wikipages in the LoadExtensionSchemaUpdates hook can be problematic, as other extensions may bind to hooks like PageContentSaveComplete. Those other extensions then might access the database which is not up to date yet, causing an exception.

Using a LoggedUpdateMaintenance script makes sure the modifications to wikipages occur after the database has been fully updated.

Created by: Alexia

Thanks! I will merge this and pull it down to get it fully tested.