Set ENABLE_LOAD_BALANCING_FOR_SIDEKIQ=true on production

We should set environment varialbe ENABLE_LOAD_BALANCING_FOR_SIDEKIQ to true in order to enable load balancing for Sidekiq.

This environment variable will only enable load balancing. All workers will still default to :always data consistency - the worker is required to use primary!

• Enable LoadBalancing for Sidekiq on production
• Prepare for sidekiq read-replica traffic to pgbouncer