The feature flag has been introduced an was turned off by default,
now the it will default to be turned on. That change would still allow
users to turn this feature off by leveraging the Rails console by
running:

`Feature.disable("gitaly_catfile-cache")`

Another option is to manage the number of items the LRU cache will
contain, by updating the `config.toml` for Gitaly. This would be the
`catfile_cache_size`:
https://gitlab.com/gitlab-org/gitaly/blob/0dcb5c579e63754f557aef91a4fa7a00e5b8b127/config.toml.example#L27

Closes: https://gitlab.com/gitlab-org/gitaly/issues/1712