Enable email-alert-service subscriber list update worker in integration
Enable email-alert-service subscriber list update worker in integration

[Trello](https://trello.com/c/IkYegsOt/1225-update-subscriberlist-titles-on-major-minor-publishing-change)

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet