Remove the option to use persistent caching as a default strategy

Problem/Motivation

We offer an option to persist certain cache bins so their data will survive full cache clears. This is useful for data that is too expensive to recalculate every time the caches are cleared. However we also have an option to make the persistent caching strategy the default for all cache bins. This is not a good idea since the vast majority of cache bins in Drupal are for cheap data and retaining all of it will just fill up disk space.

Proposed resolution

Remove the option.