database: quiet external service migration errors
Created by: LawnGnome
The OOB migrator added in #26759 to populate the has_webhooks
field of external services would error if the JSON configuration in the external service record was invalid. It turns out that we have at least one external service on cloud that has invalid JSON, as this wasn't always enforced, so this means the OOB migration will never succeed.
Instead, we'll demote that to a log message and complete the migration anyway.