Remove metrics auth proxy

[mikenairn]

Removes the metrics auth proxy container from the default deployment to make it consistent with all other kuadrant components.

Verifiction

Terminal 1:

make local-setup local-deploy
kubectl -n dns-operator-system port-forward service/dns-operator-controller-manager-metrics-service 28080:8080

Terminal 2:

curl http://127.0.0.1:28080/metrics                               
# HELP certwatcher_read_certificate_errors_total Total number of certificate read errors                               
# TYPE certwatcher_read_certificate_errors_total counter                                                               
certwatcher_read_certificate_errors_total 0                                                                            
# HELP certwatcher_read_certificate_total Total number of certificate reads                                            
# TYPE certwatcher_read_certificate_total counter                                                                      
certwatcher_read_certificate_total 0                                                                                                                                                                                                          
# HELP controller_runtime_active_workers Number of currently used workers per controller                               
# TYPE controller_runtime_active_workers gauge                                                                         
controller_runtime_active_workers{controller="dnshealthcheckprobe"} 0                                                  
controller_runtime_active_workers{controller="dnsrecord"} 0                                                            
controller_runtime_active_workers{controller="managedzone"} 0 
...

[mikenairn]

@eguzki Would you mind casting your eye over this if you have a minute? I think you removed the proxy from most of the other operators, at least limitador and kuadrant operators.

[eguzki]

I was comparing changes with Kuadrant/kuadrant-operator#33 and LGTM

Verification steps pass 🆗