[exporter/datadog] Refactor WaitGroup into separate fields for traces and metrics exporter #34198

Job	Run time
collector-build	4m 9s
docker-build	5m 42s
supervisor-test	0s
kubernetes-test-matrix (v1.26.0, receiver/k8sclusterreceiver)	5m 15s
kubernetes-test-matrix (v1.26.0, processor/k8sattributesprocessor)	4m 26s
kubernetes-test-matrix (v1.26.0, receiver/kubeletstatsreceiver)	4m 13s
kubernetes-test-matrix (v1.26.0, receiver/k8sobjectsreceiver)	3m 12s
kubernetes-test-matrix (v1.25.3, receiver/k8sclusterreceiver)	4m 9s
kubernetes-test-matrix (v1.25.3, processor/k8sattributesprocessor)	4m 23s
kubernetes-test-matrix (v1.25.3, receiver/kubeletstatsreceiver)	4m 16s
kubernetes-test-matrix (v1.25.3, receiver/k8sobjectsreceiver)	3m 24s
kubernetes-test-matrix (v1.24.7, receiver/k8sclusterreceiver)	5m 9s
kubernetes-test-matrix (v1.24.7, processor/k8sattributesprocessor)	4m 24s
kubernetes-test-matrix (v1.24.7, receiver/kubeletstatsreceiver)	4m 17s
kubernetes-test-matrix (v1.24.7, receiver/k8sobjectsreceiver)	3m 42s
kubernetes-test-matrix (v1.23.13, receiver/k8sclusterreceiver)	4m 51s
kubernetes-test-matrix (v1.23.13, processor/k8sattributesprocessor)	4m 31s
kubernetes-test-matrix (v1.23.13, receiver/kubeletstatsreceiver)	4m 29s
kubernetes-test-matrix (v1.23.13, receiver/k8sobjectsreceiver)	3m 13s
kubernetes-test	1s
	1h 17m 46s

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