Feature flag default on catfile cache

What does this MR do?

Set the feature flag to default to on for the catfile cache.

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

lib/gitlab/gitaly_client.rb

@@ -240,7 +240,6 @@ def self.session_id
       Gitlab::SafeRequestStore[:gitaly_session_id] ||= SecureRandom.uuid
     end
 
-
     def self.token(storage)
       params = Gitlab.config.repositories.storages[storage]
       raise "storage not found: #{storage.inspect}" if params.nil?