Fail pagerduty automations if projects aren't Pagerduty services

[in-op]

Currently the pagerduty automations to create service associations or remove them will exit early (considered a success) if either project does not exist in Pagerduty. Since the user flipped the switch, they probably expect the services are in there, and we should fail in these cases and tell the user that the project doesn't exist. Then they can determine if they want to add it to Pagerduty first or skip that automation.