Enhance the unit conversion in the EMF Exporter #927

Job	Run time
collector-build	7m 6s
docker-build	7m 21s
supervisor-test	1m 9s
kubernetes-test-matrix (v1.30.0, receiver/k8sclusterreceiver)	4m 49s
kubernetes-test-matrix (v1.30.0, processor/k8sattributesprocessor)	5m 35s
kubernetes-test-matrix (v1.30.0, receiver/kubeletstatsreceiver)	4m 6s
kubernetes-test-matrix (v1.30.0, receiver/k8sobjectsreceiver)	3m 17s
kubernetes-test-matrix (v1.23.17, receiver/k8sclusterreceiver)	4m 43s
kubernetes-test-matrix (v1.23.17, processor/k8sattributesprocessor)	6m 11s
kubernetes-test-matrix (v1.23.17, receiver/kubeletstatsreceiver)	4m 12s
kubernetes-test-matrix (v1.23.17, receiver/k8sobjectsreceiver)	3m 14s
kubernetes-test	1s
	51m 44s

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