[exporter/awsemf] Add AppSignals metadata flag into user-agent in EMF exporter #34301

Job	Run time
collector-build	5m 24s
docker-build	6m 1s
supervisor-test	1m 1s
kubernetes-test-matrix (v1.26.0, receiver/k8sclusterreceiver)	4m 50s
kubernetes-test-matrix (v1.26.0, processor/k8sattributesprocessor)	4m 27s
kubernetes-test-matrix (v1.26.0, receiver/kubeletstatsreceiver)	4m 15s
kubernetes-test-matrix (v1.26.0, receiver/k8sobjectsreceiver)	3m 17s
kubernetes-test-matrix (v1.25.3, receiver/k8sclusterreceiver)	4m 59s
kubernetes-test-matrix (v1.25.3, processor/k8sattributesprocessor)	4m 30s
kubernetes-test-matrix (v1.25.3, receiver/kubeletstatsreceiver)	4m 15s
kubernetes-test-matrix (v1.25.3, receiver/k8sobjectsreceiver)	3m 15s
kubernetes-test-matrix (v1.24.7, receiver/k8sclusterreceiver)	4m 44s
kubernetes-test-matrix (v1.24.7, processor/k8sattributesprocessor)	4m 35s
kubernetes-test-matrix (v1.24.7, receiver/kubeletstatsreceiver)	4m 33s
kubernetes-test-matrix (v1.24.7, receiver/k8sobjectsreceiver)	3m 31s
kubernetes-test-matrix (v1.23.13, receiver/k8sclusterreceiver)	4m 47s
kubernetes-test-matrix (v1.23.13, processor/k8sattributesprocessor)	4m 49s
kubernetes-test-matrix (v1.23.13, receiver/kubeletstatsreceiver)	4m 16s
kubernetes-test-matrix (v1.23.13, receiver/k8sobjectsreceiver)	3m 29s
kubernetes-test	1s
	1h 20m 59s

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