Draft: Change the type of certain Wikidata-referring keys to Z1 or list of Z1
These are keys that refer to instances of a Wikidata type, such as Z6001-Z6006 (or lists of such instances). This is an interim change, to allow for Z6/String to appear in instances of these keys (until evolution of Wikifunctions allows for references to appear in them).
Bug: T370341 Bug: T370343 Bug: T370346
Closes T370341