Add option to include reported statuses in warning e-mail (#11639)

app/controllers/admin/account_actions_controller.rb

app/javascript/styles/mailer.scss

app/mailers/user_mailer.rb

app/models/admin/account_action.rb

app/views/admin/account_actions/new.html.haml

app/views/notification_mailer/_status.html.haml

app/views/user_mailer/warning.html.haml

app/views/user_mailer/warning.text.erb

config/locales/en.yml

config/locales/simple_form.en.yml

spec/mailers/previews/user_mailer_preview.rb

spec/models/admin/account_action_spec.rb