Add service manual to Jenkins dependent applications
Add service manual to Jenkins dependent applications

We've updated the service manual to Jenkins 2, and set up content schema
tests per the ops manual. This adds `service-manual-publisher` and
`service-manual-frontend` to the list of dependent applications in the
Jenkins config, to ensure their tests are run when the schemas change.

alphagov/govuk-content-schemas,alphagov/govuk-content-schemas