[exporter/loadbalancing] Change config fields to use snake_case #30621

Job	Run time
collector-build	5m 5s
docker-build	5m 34s
supervisor-test	1m 36s
kubernetes-test-matrix (v1.26.0, receiver/k8sclusterreceiver)	4m 48s
kubernetes-test-matrix (v1.26.0, processor/k8sattributesprocessor)	4m 27s
kubernetes-test-matrix (v1.26.0, receiver/kubeletstatsreceiver)	4m 9s
kubernetes-test-matrix (v1.26.0, receiver/k8sobjectsreceiver)	3m 24s
kubernetes-test-matrix (v1.25.3, receiver/k8sclusterreceiver)	5m 1s
kubernetes-test-matrix (v1.25.3, processor/k8sattributesprocessor)	4m 27s
kubernetes-test-matrix (v1.25.3, receiver/kubeletstatsreceiver)	4m 21s
kubernetes-test-matrix (v1.25.3, receiver/k8sobjectsreceiver)	3m 14s
kubernetes-test-matrix (v1.24.7, receiver/k8sclusterreceiver)	4m 42s
kubernetes-test-matrix (v1.24.7, processor/k8sattributesprocessor)	4m 21s
kubernetes-test-matrix (v1.24.7, receiver/kubeletstatsreceiver)	4m 27s
kubernetes-test-matrix (v1.24.7, receiver/k8sobjectsreceiver)	3m 21s
kubernetes-test-matrix (v1.23.13, receiver/k8sclusterreceiver)	4m 56s
kubernetes-test-matrix (v1.23.13, processor/k8sattributesprocessor)	4m 37s
kubernetes-test-matrix (v1.23.13, receiver/kubeletstatsreceiver)	4m 15s
kubernetes-test-matrix (v1.23.13, receiver/k8sobjectsreceiver)	3m 32s
kubernetes-test	1s
	1h 20m 18s

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