kube-prometheus: simplify service monitors

...ometheus/prometheus-k8s-service-monitor-alertmanager.yaml

.../prometheus/prometheus-k8s-service-monitor-apiserver.yaml

...ometheus-k8s-service-monitor-kube-controller-manager.yaml

...etheus/prometheus-k8s-service-monitor-kube-scheduler.yaml

...us/prometheus-k8s-service-monitor-kube-state-metrics.yaml

...ts/prometheus/prometheus-k8s-service-monitor-kubelet.yaml

...metheus/prometheus-k8s-service-monitor-node-exporter.yaml

...prometheus/prometheus-k8s-service-monitor-prometheus.yaml