[exporter/datadog] Use statswriter, client aggregator is for tracer stats only #26557

Job	Run time
collector-build	5m 24s
docker-build	5m 46s
supervisor-test	1m 0s
kubernetes-test-matrix (v1.26.0, receiver/k8sclusterreceiver)	4m 44s
kubernetes-test-matrix (v1.26.0, processor/k8sattributesprocessor)	3m 12s
kubernetes-test-matrix (v1.26.0, receiver/kubeletstatsreceiver)	4m 8s
kubernetes-test-matrix (v1.26.0, receiver/k8sobjectsreceiver)	3m 15s
kubernetes-test-matrix (v1.25.3, receiver/k8sclusterreceiver)	4m 45s
kubernetes-test-matrix (v1.25.3, processor/k8sattributesprocessor)	3m 32s
kubernetes-test-matrix (v1.25.3, receiver/kubeletstatsreceiver)	4m 23s
kubernetes-test-matrix (v1.25.3, receiver/k8sobjectsreceiver)	3m 24s
kubernetes-test-matrix (v1.24.7, receiver/k8sclusterreceiver)	4m 49s
kubernetes-test-matrix (v1.24.7, processor/k8sattributesprocessor)	3m 34s
kubernetes-test-matrix (v1.24.7, receiver/kubeletstatsreceiver)	4m 16s
kubernetes-test-matrix (v1.24.7, receiver/k8sobjectsreceiver)	3m 19s
kubernetes-test-matrix (v1.23.13, receiver/k8sclusterreceiver)	4m 49s
kubernetes-test-matrix (v1.23.13, processor/k8sattributesprocessor)	3m 31s
kubernetes-test-matrix (v1.23.13, receiver/kubeletstatsreceiver)	4m 13s
kubernetes-test-matrix (v1.23.13, receiver/k8sobjectsreceiver)	3m 18s
kubernetes-test	1s
	1h 15m 23s

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