Add flag metrics-addr for Helm/Ansible

[camilamacedo86]

Feature Request

The new helm layout is working with the current/legacy image of the operator-sdk helm. This image is not allowing users to customize the metrics port.

We need to:

• Update the implementation in cmd/helm|ansible-operator/main.go which is used to generate bin. See: [ansible/helm] remove operator-sdk binary from ansible/helm base images #3331
• Change the main implementation to use flag as it is in the GO type. See:

        
	pflag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
        ... 
       options := ctrl.Options{
		MetricsBindAddress:      metricsAddr,
		LeaderElection:          enableLeaderElection,
		LeaderElectionID:        leaderElectionID,
		LeaderElectionNamespace: leaderElectionNamespace,
		NewClient:               manager.NewDelegatingClientFunc(),
	}

• Update the helm/ansible manager template to use these flags. (internal/plugins/helm/v1/scaffolds/templates/manager/config.go)
• Update the helm/ansible auth_proxy_patch (internal/plugins/helm/v1/scaffolds/templates/metricsauth/auth_proxy_patch.go) to use the enableLeaderElection flag. See: https://github.com/kubernetes-sigs/kubebuilder/blob/master/pkg/plugin/v3/scaffolds/internal/templates/metricsauth/auth_proxy_patch.go#L68-L70

Important: we should scaffold the projects to use by default the same go/kb port in order to keep a standard across all projects and then, describe in the migration guide how the users are able to still use the current port and no face breaking changes if they wish.