Mute critical KubeAPIErrorBudgetBurn alerts

We have muted the critical KubeAPIErrorBudgetBurn alerts.

The KubeAPIErrorBudgetBurn alerts are used to measure the SLO and is meant to point to issues or bad performance of the APIServer. While we will still receive the warning alerts we won’t route the critical alerts through our escalation system anymore as don’t consider this as something to be acted on outside of office hours.

This has already been rolled out everywhere.