Add cron jobs to manage gor during data sync
Add cron jobs to manage gor during data sync

We manage traffic replay with our puppet class `govuk_gor`, which
we would like to be disabled when our `govuk_env_sync` data sync
`pull` jobs happen. They currently take place between 23:15 and 5:30.

Setting the Puppet `data_sync_in_progress` fact to `true` ensures
that Puppet does not try to run traffic replay until all the data
sync jobs have completed. This should reduce noise and unnecessary
errors appearing in Sentry.

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