Allow refresh rate feature to be disabled
Description
Allow refresh rate feature to be disabled
We should allow refresh rate feature to be disabled via feature flag.
Enabling refresh rate for all user might have impact in performance if too many of them enable it. We want to release this feature and monitor it's behavior.
This comes from the feedback at gitlab-com/gl-infra/scalability#482 (comment 380644609)
Definition of Done
Do we should track results of the new behaviour here after the next milestone.
Edited by Miguel Rincon