[exporter/loadbalancing] Set a placeholder endpoint #27198

Job	Run time
docker-build	5m 22s
collector-build	5m 2s
supervisor-test	1m 1s
kubernetes-test-matrix (v1.26.0, receiver/k8sclusterreceiver)	4m 36s
kubernetes-test-matrix (v1.26.0, processor/k8sattributesprocessor)	3m 5s
kubernetes-test-matrix (v1.26.0, receiver/kubeletstatsreceiver)	4m 9s
kubernetes-test-matrix (v1.26.0, receiver/k8sobjectsreceiver)	3m 14s
kubernetes-test-matrix (v1.25.3, receiver/k8sclusterreceiver)	4m 46s
kubernetes-test-matrix (v1.25.3, processor/k8sattributesprocessor)	3m 16s
kubernetes-test-matrix (v1.25.3, receiver/kubeletstatsreceiver)	4m 15s
kubernetes-test-matrix (v1.25.3, receiver/k8sobjectsreceiver)	3m 29s
kubernetes-test-matrix (v1.24.7, receiver/k8sclusterreceiver)	4m 38s
kubernetes-test-matrix (v1.24.7, processor/k8sattributesprocessor)	3m 22s
kubernetes-test-matrix (v1.24.7, receiver/kubeletstatsreceiver)	4m 10s
kubernetes-test-matrix (v1.24.7, receiver/k8sobjectsreceiver)	3m 17s
kubernetes-test-matrix (v1.23.13, receiver/k8sclusterreceiver)	4m 53s
kubernetes-test-matrix (v1.23.13, processor/k8sattributesprocessor)	3m 31s
kubernetes-test-matrix (v1.23.13, receiver/kubeletstatsreceiver)	4m 21s
kubernetes-test-matrix (v1.23.13, receiver/k8sobjectsreceiver)	3m 21s
kubernetes-test	1s
	1h 13m 49s

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