[Serve] Expose replica and controller urls on load balancer #3351
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We now expose replica URLs from the load balancer for better metrics support.
Future TODO:
Tested (run the relevant ones):
bash format.sh
sky serve up -n test examples/serve/http_server/task.yaml
curl $(sky serve status --endpoint test)/-/urls
pytest tests/test_smoke.py
pytest tests/test_smoke.py::test_fill_in_the_name
bash tests/backward_comaptibility_tests.sh