Add tech contacts & info & name@name to force delete mailer

See #1477

app/mailers/domain_delete_mailer.rb

@@ -44,7 +44,7 @@ class DomainDeleteMailer < ApplicationMailer
 
     subject = default_i18n_subject(domain_name: domain.name)
     mail(from: forced_email_from,
-         to: domain.primary_contact_emails,
+         to: domain.force_delete_contact_emails,
          subject: subject,
          template_path: 'mailers/domain_delete_mailer/forced',
          template_name: template_name)

app/models/domain.rb

@@ -587,6 +587,15 @@ class Domain < ApplicationRecord
     (admin_contacts.emails + [registrant.email]).uniq
   end
 
+  def force_delete_contact_emails
+    (primary_contact_emails + tech_contacts.pluck(:email) +
+      ["info@#{name}", "#{prepared_domain_name}@#{name}"]).uniq
+  end
+
+  def prepared_domain_name
+    name.split('.')&.first
+  end
+
   def new_registrant_email
     pending_json['new_registrant_email']
   end

test/mailers/domain_delete_mailer_test.rb

@@ -73,7 +73,7 @@ class DomainDeleteMailerTest < ActionMailer::TestCase
 
     assert_emails 1
     assert_equal ['legal@registry.test'], email.from
-    assert_equal %w[jane@mail.test john@inbox.test], email.to
+    assert_equal @domain.force_delete_contact_emails, email.to
     assert_equal 'Domeen shop.test on kustutusmenetluses' \
                  ' / Domain shop.test is in deletion process' \
                  ' / Домен shop.test в процессе удаления', email.subject