force spam checks for support-bot issues

app/models/ee/issue.rb

+module EE
+  module Issue
+    # override
+    def check_for_spam?
+      return true if author.support_bot?
+
+      super
+    end
+  end
+end

app/models/issue.rb

 require 'carrierwave/orm/activerecord'
 
 class Issue < ActiveRecord::Base
+  prepend EE::Issue
+
   include InternalId
   include Issuable
   include Referable