Add useragent to awsemfexporter #43474

Job	Run time
collector-build	5m 52s
docker-build	6m 13s
supervisor-test	40s
kubernetes-test-matrix (v1.30.0, receiver/k8sclusterreceiver)	4m 27s
kubernetes-test-matrix (v1.30.0, processor/k8sattributesprocessor)	6m 10s
kubernetes-test-matrix (v1.30.0, receiver/kubeletstatsreceiver)	3m 57s
kubernetes-test-matrix (v1.30.0, receiver/k8sobjectsreceiver)	3m 8s
kubernetes-test-matrix (v1.23.17, receiver/k8sclusterreceiver)	4m 34s
kubernetes-test-matrix (v1.23.17, processor/k8sattributesprocessor)	6m 25s
kubernetes-test-matrix (v1.23.17, receiver/kubeletstatsreceiver)	4m 10s
kubernetes-test-matrix (v1.23.17, receiver/k8sobjectsreceiver)	3m 6s
kubernetes-test	1s
	48m 43s

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