Remove DataDog smoke test alerts
Remove DataDog smoke test alerts

We are moving to Concourse alerting for smoke test failures directly,
rather than sending the information to DataDog to then be sent on to
PagerDuty.

alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf