Test if the danger comment works for deletion only

Placeholder description for the commit.

Changelog: changed

ee/app/mailers/previews/gitlab_subscriptions/seat_usage_mailer_preview.rb

-# frozen_string_literal: true
-
-module GitlabSubscriptions
-  class SeatUsageMailerPreview < ActionMailer::Preview
-    def exceeded_purchased_seats
-      ::GitlabSubscriptions::SeatUsageMailer.exceeded_purchased_seats(
-        user: User.first,
-        subscription_name: 'A-123456',
-        seat_overage: 5
-      )
-    end
-  end
-end