Add fix for re-registration when Consul K8s rolling restarts agent nodes

.changelog/227.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+Properly handle re-registration of deployed gateways when an agent no longer has the gateway in its catalog
+```

internal/consul/registration.go

@@ -93,13 +93,17 @@ func (s *ServiceRegistry) ensureRegistration(ctx context.Context) {
 		return
 	}
 
-	var statusError *api.StatusError
+	var statusError api.StatusError
 	if errors.As(err, &statusError) {
 		if statusError.Code == http.StatusNotFound {
 			if err := s.retryRegistration(ctx); err != nil {
 				s.logger.Error("error registering service", "error", err)
 				return
 			}
+			s.logger.Info("successfully registered agent service")
+			// early return here because we had no error
+			// re-registering, so don't log
+			return
 		}
 	}
 	s.logger.Error("error fetching service", "error", err)