[receiver/prometheusremotewrite] Parse labels #46548

Job	Run time
collector-build	6m 2s
docker-build	6m 12s
supervisor-test	53s
kubernetes-test-matrix (v1.30.0, receiver/k8sclusterreceiver)	6m 37s
kubernetes-test-matrix (v1.30.0, processor/k8sattributesprocessor)	6m 30s
kubernetes-test-matrix (v1.30.0, receiver/kubeletstatsreceiver)	4m 1s
kubernetes-test-matrix (v1.30.0, receiver/k8sobjectsreceiver)	3m 14s
kubernetes-test-matrix (v1.23.17, receiver/k8sclusterreceiver)	6m 31s
kubernetes-test-matrix (v1.23.17, processor/k8sattributesprocessor)	6m 32s
kubernetes-test-matrix (v1.23.17, receiver/kubeletstatsreceiver)	4m 7s
kubernetes-test-matrix (v1.23.17, receiver/k8sobjectsreceiver)	3m 10s
kubernetes-test	1s
	53m 50s

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