frontend: use endpoint port if prometheus.io/port annotation is missing
Created by: keegancsmith
Previously we excluded indexed-search from scraping. Instead we use the same behaviour as prometheus and use the endpoint port of the annotation is missing.
Note: we still won't proxy to zoekt-indexserver. This would require us to watch the pods as well, since we don't have any services setup for zoekt-indexserver.
Alternatively we can just add the annotation to indexed-search :)