[exporter/kinetica] mark Unmaintained #47399

Job	Run time
collector-build	6m 11s
docker-build	6m 14s
supervisor-test	57s
kubernetes-test-matrix (v1.30.0, receiver/k8sclusterreceiver)	6m 39s
kubernetes-test-matrix (v1.30.0, processor/k8sattributesprocessor)	6m 24s
kubernetes-test-matrix (v1.30.0, receiver/kubeletstatsreceiver)	4m 12s
kubernetes-test-matrix (v1.30.0, receiver/k8sobjectsreceiver)	3m 3s
kubernetes-test-matrix (v1.23.17, receiver/k8sclusterreceiver)	6m 44s
kubernetes-test-matrix (v1.23.17, processor/k8sattributesprocessor)	6m 46s
kubernetes-test-matrix (v1.23.17, receiver/kubeletstatsreceiver)	4m 8s
kubernetes-test-matrix (v1.23.17, receiver/k8sobjectsreceiver)	3m 14s
kubernetes-test	1s
	54m 33s

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