Investigate what context feature flag calls are made in

1. We may want to make current request actor the default for feature flag calls (e.g. Feature.enabled?(:flag))
2. I see a lot of feature flags without actors are not necessarily request based - they are either on/off, no rollouts. So maybe :instance actor is better
3. Also we need to see if there are many feature flag calls outside of SafeRequestStore context. If they are then, the current request actor is not suitable. For example the defer sidekiq feature flags may be one such case