Strange/inaccurate permissions check results on some queries for servers with apcu extension enabled

[zerocrates]

Two reports on the forums: https://forum.omeka.org/t/item-s-not-found/10268 and some from other sources.

The issue is the Doctrine query cache: it doesn't play nicely with the SQL filters we use to handle permission checking at the query level. The "array" cache works fine because it is refreshed for each request and therefore only has the context of a single user, but with the apcu cache, the SQL used for a particular DQL can get "stuck" with the wrong user's permissions.

Doctrine doesn't have any great options at the moment for us to keep the filter and the cache: filters are assumed by the caching system to be static in their operation.

Temporary solution: force the query cache to use the "array" implementation for all users, even those with apcu installed.