Enable feature catfile_cache_nonrepeating by default
It has not been clear in the production metrics if this feature flag has been working. So here we are enabling it by default as a fairly safe way to enable this in a reversible way.
If this doesn't work then the initial assessment was probably incorrect, that changing the cache keys probably exacerbated the bug. If that's the case then we should prioritize Catfile cache architecture (#6664)
Edited by James Fargher