Issue
You have herokuconnect in your app.json but see the error:
herokuconnect has opted out of supporting review and ci apps
When trying to use Review or CI Apps.
Resolution
Remove herokuconnect from the addons section of your app.json. Heroku Connect does not presently support Review or CI Apps. Removing this from your app.json file will allow your Review and CI apps to build without error and your production applications will continue to have the herokuconnect addon provisioned.