Remove unnecessary Gitlab::Redis require statements

lib/gitlab/redis/cache.rb

 # frozen_string_literal: true
 
-# please require all dependencies below:
-require_relative 'wrapper' unless defined?(::Rails) && ::Rails.root.present?
-
 module Gitlab
   module Redis
     class Cache < ::Gitlab::Redis::Wrapper

lib/gitlab/redis/queues.rb

 # frozen_string_literal: true
 
-# please require all dependencies below:
+# We need this require for MailRoom
 require_relative 'wrapper' unless defined?(::Gitlab::Redis::Wrapper)
 
 module Gitlab

lib/gitlab/redis/shared_state.rb

 # frozen_string_literal: true
 
-# please require all dependencies below:
-require_relative 'wrapper' unless defined?(::Gitlab::Redis::Wrapper)
-
 module Gitlab
   module Redis
     class SharedState < ::Gitlab::Redis::Wrapper