[chore] [receiver/kubeletstats] move utilization metrics in standalone helper func #34551

Job	Run time
docker-build	7m 26s
collector-build	7m 15s
supervisor-test	1m 21s
kubernetes-test-matrix (v1.26.0, receiver/k8sclusterreceiver)	4m 50s
kubernetes-test-matrix (v1.26.0, processor/k8sattributesprocessor)	4m 42s
kubernetes-test-matrix (v1.26.0, receiver/kubeletstatsreceiver)	4m 13s
kubernetes-test-matrix (v1.26.0, receiver/k8sobjectsreceiver)	4m 6s
kubernetes-test-matrix (v1.25.3, receiver/k8sclusterreceiver)	5m 6s
kubernetes-test-matrix (v1.25.3, processor/k8sattributesprocessor)	4m 53s
kubernetes-test-matrix (v1.25.3, receiver/kubeletstatsreceiver)	4m 25s
kubernetes-test-matrix (v1.25.3, receiver/k8sobjectsreceiver)	3m 14s
kubernetes-test-matrix (v1.24.7, receiver/k8sclusterreceiver)	5m 17s
kubernetes-test-matrix (v1.24.7, processor/k8sattributesprocessor)	4m 31s
kubernetes-test-matrix (v1.24.7, receiver/kubeletstatsreceiver)	4m 28s
kubernetes-test-matrix (v1.24.7, receiver/k8sobjectsreceiver)	3m 35s
kubernetes-test-matrix (v1.23.13, receiver/k8sclusterreceiver)	4m 42s
kubernetes-test-matrix (v1.23.13, processor/k8sattributesprocessor)	4m 38s
kubernetes-test-matrix (v1.23.13, receiver/kubeletstatsreceiver)	4m 43s
kubernetes-test-matrix (v1.23.13, receiver/k8sobjectsreceiver)	3m 18s
kubernetes-test	1s
	1h 26m 44s

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