Allow to remove support for invalidateAll() and treat it as deleteAll()

This seems to work quite well, tested quite a bit in combination with a few core performance issues I worked on.

Merged, also created a change record.

Automatically closed - issue fixed for 2 weeks with no activity.

@berdir is there a downside to opting into this? seems like the same data would be returned in both cases but without the cache tag lookup? I wasn't sure if deleteall hit any other data that would not normally be cleared, for example if it hits a cache with a different prefix.