Register frontendproxy service with service directory for uptime checks

[dashpole]

Change service to an internal load balancer so it can be used for uptime checks.

Register the service with service directory.

I've already applied both the updated service and the service directory registration to the cluster, and the uptime checks work properly.

[damemi]

I've already applied both the updated service and the service directory registration to the cluster, and the uptime checks work properly.

in the future, we should try not to test changes like this in the shared cluster and use a personal test project instead

[dashpole]

link failure seems unrelated: https://coralogix.com/blog/configure-otel-demo-send-telemetry-data-coralogix