Create Redisable#redis (#9633)

* Create Redisable

* Use #redis instead of Redis.current

app/workers/scheduler/feed_cleanup_scheduler.rb

@@ -2,6 +2,7 @@
 
 class Scheduler::FeedCleanupScheduler
   include Sidekiq::Worker
+  include Redisable
 
   sidekiq_options unique: :until_executed, retry: 0
 
@@ -57,8 +58,4 @@ class Scheduler::FeedCleanupScheduler
   def feed_manager
     FeedManager.instance
   end
-
-  def redis
-    Redis.current
-  end
 end