Get alerted when number of errors gets too high

[vLia]

Follow-up to https://github.com/kubeshop/testkube/issues/1553

Is your feature request related to a problem? Please describe. Errors are not monitored and alerted on.

Describe the solution you'd like As we are already having Prometheus with Alert manager running in our clusters, we could either use that to monitor the number of errors and send us an alert to a dedicated Slack channel.

Describe alternatives you've considered GCP offers Cloud Monitoring - but using Prometheus would not make it vendor-dependent.