This commit enables users to opt in to check for critical alerts firing
in the cluster post chaos at the end of each scenario. Chaos scenario is
considered as failed if the cluster is unhealthy in which case user can
start debugging to fix and harden respective areas.
Fixes https://github.com/redhat-chaos/krkn/issues/410
This commit enables alerting in Kraken based on the Prometheus queries defined
by the user and modifies the return code of the run to determine pass/fail for
the run.