Add alert for blocked gitlab account when users are unable to save/commit needles
- AC1: Alert exists for "blocked openqa-pusher gitlab account"
- Look into existing minion related alerts
- Crosscheck existing alert levels
- Potentially extend the openQA influxdb API endpoint to more explicitly tell about the types of minion jobs to fail
- Ensure there is a grafana alert working based on above data to alert us if the gitlab needle openqa-pusher account would be blocked again