Incorrect health check URL for OPA AMS

[esnible]

The opa-ams sidecar of the dev/test Observatorium API is sending error spans to the internal Jaeger. The errors are 404s when doing GET :8082/

I suspect the reason is that the sidecar is started with --web.healthchecks.url=http://127.0.0.1:8082, but that URL 404s.
See https://github.com/rhobs/configuration/blob/main/resources/services/observatorium-template.yaml#L296

I don't know what the correct health check URL is. Note that OPA AMS is started with --ams.url=${OCM_BASE_URL}
(This is not overridden anywhere on dev/test, as can be verified with kubectl -n observatorium-testing exec deployment/observatorium-observatorium-api -c opa-ams -- ps -ef.)