Actually implement proxy URL for loki destinations #804

Job	Run time
List tests	4s
Integration Test (annotation-autodiscovery)	3m 4s
Integration Test (auth)	3m 54s
Integration Test (auto-instrumentation)	4m 48s
Integration Test (cluster-monitoring)	4m 21s
Integration Test (control-plane-monitoring)	5m 6s
Integration Test (integration-cert-manager)	3m 39s
Integration Test (integration-grafana)	4m 16s
Integration Test (integration-loki)	3m 32s
Integration Test (integration-mysql)	3m 55s
Integration Test (integration-tempo)	3m 3s
Integration Test (istio-service-mesh)	4m 13s
Integration Test (profiling)	2m 53s
Integration Test (prometheus-io-annotations)	4m 8s
Integration Test (sharded-kube-state-metrics)	4m 6s
Integration Test (split-destinations)	3m 18s
Integration Test (statsd)	2m 43s
Integration Test (terraform-deployment)	3m 23s
	1h 4m 26s

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