[chore] migrate metrics to mdatagen (#33514) #35603

Job	Run time
collector-build	5m 31s
docker-build	5m 41s
supervisor-test	55s
kubernetes-test-matrix (v1.30.0, receiver/k8sclusterreceiver)	4m 41s
kubernetes-test-matrix (v1.30.0, processor/k8sattributesprocessor)	5m 6s
kubernetes-test-matrix (v1.30.0, receiver/kubeletstatsreceiver)	4m 9s
kubernetes-test-matrix (v1.30.0, receiver/k8sobjectsreceiver)	3m 0s
kubernetes-test-matrix (v1.23.17, receiver/k8sclusterreceiver)	4m 51s
kubernetes-test-matrix (v1.23.17, processor/k8sattributesprocessor)	4m 55s
kubernetes-test-matrix (v1.23.17, receiver/kubeletstatsreceiver)	4m 24s
kubernetes-test-matrix (v1.23.17, receiver/k8sobjectsreceiver)	3m 20s
kubernetes-test	1s
	46m 34s

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