Add rejection reasons for IRP emails

Adds the rejection reasons given in the ticket. I've also updated the
notify email rejection template to work with these reasons.

spec/features/admin_view_claim_spec.rb

@@ -1,11 +1,5 @@
 require "rails_helper"
 
 RSpec.feature "Admin view claim" do
-  Policies.all.each do |policy|
-    # FIXME RL temp stub out this test until we've added rejection reasons for
-    # IRP
-    unless policy == Policies::InternationalRelocationPayments
-      it_behaves_like "Admin View Claim Feature", policy
-    end
-  end
+  Policies.all.each { |policy| it_behaves_like "Admin View Claim Feature", policy }
 end