[chore] update promrw exporter to use mdatagen for internal metrics #34026

Job	Run time
collector-build	5m 25s
docker-build	5m 55s
supervisor-test	58s
kubernetes-test-matrix (v1.26.0, receiver/k8sclusterreceiver)	5m 6s
kubernetes-test-matrix (v1.26.0, processor/k8sattributesprocessor)	4m 24s
kubernetes-test-matrix (v1.26.0, receiver/kubeletstatsreceiver)	4m 35s
kubernetes-test-matrix (v1.26.0, receiver/k8sobjectsreceiver)	3m 28s
kubernetes-test-matrix (v1.25.3, receiver/k8sclusterreceiver)	4m 44s
kubernetes-test-matrix (v1.25.3, processor/k8sattributesprocessor)	4m 23s
kubernetes-test-matrix (v1.25.3, receiver/kubeletstatsreceiver)	4m 25s
kubernetes-test-matrix (v1.25.3, receiver/k8sobjectsreceiver)	3m 17s
kubernetes-test-matrix (v1.24.7, receiver/k8sclusterreceiver)	4m 47s
kubernetes-test-matrix (v1.24.7, processor/k8sattributesprocessor)	4m 40s
kubernetes-test-matrix (v1.24.7, receiver/kubeletstatsreceiver)	4m 15s
kubernetes-test-matrix (v1.24.7, receiver/k8sobjectsreceiver)	3m 30s
kubernetes-test-matrix (v1.23.13, receiver/k8sclusterreceiver)	4m 47s
kubernetes-test-matrix (v1.23.13, processor/k8sattributesprocessor)	4m 38s
kubernetes-test-matrix (v1.23.13, receiver/kubeletstatsreceiver)	4m 25s
kubernetes-test-matrix (v1.23.13, receiver/k8sobjectsreceiver)	3m 26s
kubernetes-test	1s
	1h 21m 9s

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