Only track Redis calls if Peek is enabled

In dev environments, Sidekiq was encountering the message:

Circular dependency detected while autoloading constant Gitlab::Profiler

This saves some overhead during normal usage.

changelogs/unreleased/sh-disable-redis-peek.yml

+---
+title: Only track Redis calls if Peek is enabled
+merge_request: 31438
+author:
+type: performance

lib/peek/views/redis_detailed.rb

@@ -16,6 +16,7 @@ module Gitlab
       private
 
       def add_call_details(duration, args)
+        return unless peek_enabled?
         # redis-rb passes an array (e.g. [:get, key])
         return unless args.length == 1
 
@@ -26,6 +27,10 @@ module Gitlab
         }
       end
 
+      def peek_enabled?
+        Gitlab::SafeRequestStore.store[:peek_enabled]
+      end
+
       def detail_store
         ::Gitlab::SafeRequestStore['redis_call_details'] ||= []
       end