Mixed protocol is not supported for LoadBalancer service for AWS in RHOCP 4

Issue

• When attempting to configure a LoadBalancer service to handle both UDP and TCP traffic, the service-controller fails with the error mixed protocol is not supported for LoadBalancer:

  $ oc describe svc <mixed-protocol-service> -n <NAMESPACE>
  [...]
  Type:                     LoadBalancer
  
  Port:                     tcp-port  80/TCP
  TargetPort:               8080/TCP
  NodePort:                 tcp-port  32512/TCP
  Endpoints:                x.x.x.x:8080
  Port:                     udp-port  81/UDP
  TargetPort:               8081/UDP
  NodePort:                 udp-port  31702/UDP
  [...]
  Events:
   Type     Reason                  Age                From                Message
   ----     ------                  ----               ----                -------
   Normal   EnsuringLoadBalancer    43s (x8 over 10m)  service-controller  Ensuring load balancer
   Warning  SyncLoadBalancerFailed  43s (x8 over 10m)  service-controller  Error syncing load balancer: failed to ensure load balancer: mixed protocol is not supported for LoadBalancer
  
  

  Service remains in pending state:

  $ oc get svc <mixed-protocol-service> -n <NAMESPACE>
  NAME                       TYPE           CLUSTER-IP     EXTERNAL-IP   PORT(S)                     AGE
  <mixed-protocol-service>   LoadBalancer   y.y.y.y        <pending>     80:32512/TCP,81:31702/UDP