jobs: update jobs dashboard to work with GoodJob.

Update the jobs dashboard at /delayed_jobs to work with GoodJob instead
of DelayedJob.

app/policies/good_job_policy.rb

@@ -1,6 +1,10 @@
 # frozen_string_literal: true
 
-class DelayedJobPolicy < ApplicationPolicy
+class GoodJobPolicy < ApplicationPolicy
+  def index?
+    true
+  end
+
   def update?
     user.is_admin?
   end