Remove WarmCacheService (#3527)

WarmCacheService is no longer used (removed with 5442083b3c ).
7 years ago · 336f0b0823
--- a/app/services/warm_cache_service.rb
+++ b/app/services/warm_cache_service.rb
@ -1,8 +0,0 @@
 # frozen_string_literal: true

 class WarmCacheService < BaseService
  def call(cacheable)
    full_item = cacheable.class.where(id: cacheable.id).with_includes.first
    Rails.cache.write(cacheable.cache_key, full_item)
  end
 end