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

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+class GoodJobPolicy < ApplicationPolicy
+  def index?
+    true
+  end
+
+  def update?
+    user.is_admin?
+  end
+
+  alias_method :cancel?, :update?
+  alias_method :destroy?, :update?
+  alias_method :retry?, :update?
+  alias_method :run?, :update?
+end