Add feature category

ee/spec/services/gitlab_subscriptions/notify_seats_exceeded_batch_service_spec.rb

@@ -2,7 +2,8 @@
 
 require 'spec_helper'
 
-RSpec.describe GitlabSubscriptions::NotifySeatsExceededBatchService, :timecop, :saas do
+RSpec.describe GitlabSubscriptions::NotifySeatsExceededBatchService,
+  :timecop, :saas, feature_category: :billing_and_payments do
   describe '.execute' do
     context 'when subscriptions are present' do
       let(:changed_at_time) { Time.current.beginning_of_day - 1.hour }