We can remove the `new_framework_defaults_5_2` file by using Rails 5.2
default options and overwriting the ones we haven't enabled.
We're disabling `use_authenticated_message_encryption` because, even if
we don't use it, some CONSUL installations might be using it, and
enabling this options would make it harder to decrypt existing encrypted
messages.
And we're disabling `cache_versioning` until we verify our cache keeps
working and expires as expected on production environments, particularly
for stats.
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