Wain13

### Is there an existing issue already for this feature request/idea? - [X] I have searched for an existing issue, and could not find anything. I believe this is a...

Wrong template variable in some prometheus cluster rules

2

https://github.com/cloudnative-pg/charts/blob/fd5eff94b986797100155ad4638555cda3fb5823/charts/cluster/prometheus_rules/cluster-offline.yaml#L7 https://github.com/cloudnative-pg/charts/blob/fd5eff94b986797100155ad4638555cda3fb5823/charts/cluster/prometheus_rules/cluster-ha-critical.yaml#L7 https://github.com/cloudnative-pg/charts/blob/fd5eff94b986797100155ad4638555cda3fb5823/charts/cluster/prometheus_rules/cluster-ha-warning.yaml#L7 All of the above reference the cluster name incorrectly by using `{{ $labels.job }}`, causing them to not expand in the file, which then render as blank...