Kubernetes Labeling: monitoring service (thanos, prometheus, alertmanager, etc) do not have correct labels
* Part of: **All kubernetes resources should have labels matching our Prometheus label taxonomy**: https://gitlab.com/groups/gitlab-com/gl-infra/-/epics/687 1. Ensure that all monitoring services have correct `type`, `stage`, `shard` labels 1. Update the metrics-catalog definition to reflect this: https://gitlab.com/gitlab-com/runbooks/blob/master/metrics-catalog/services/monitoring.jsonnet#L30-51 FYI @mwasilewski-gitlab @steveazz
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