[Bug]: UDP listener should be able to share a IP Port combo with a TCP/HTTP Listener

[j1m-ryan]

Version

edge

What Kubernetes platforms are you running on?

Minikube

What happened?

A stream server block that looks like

stream {
  server {
      listen 127.0.0.1:80 udp;
  }
}

Should be allowed alongside a http server block that looks like

http {
  server {
     listen 127.0.0.1:80;
  }
}

Or another stream server block with a TCP listener on the same ip port combo

stream {
   #... previous server block above
  server {
      listen 127.0.0.1:80;
  }
}

This is valid NGINX but we don't allow this in the listeners.
Eg these listeners cause a warning in the Global Configuration, but should be valid

listeners:
      - name: some-udp
        port: 5353 
        protocol: UDP
      - name: some-http
        port: 5353
        protocol: HTTP

Steps to reproduce

Deploy a GC with

listeners:
      - name: some-udp
        port: 5353 
        protocol: UDP
      - name: some-http
        port: 5353
        protocol: HTTP

See the warning in the GC events

Warning  AddedOrUpdatedWithError  28s   nginx-ingress-controller  GlobalConfiguration default/my-release-nginx-ingress-controller is updated with errors: spec.listeners.port: Invalid value: 5353: Listener some-http: Port 5353 is used with a different protocol (current: UDP, new: HTTP)

Expected behaviour

No warning because its valid nginx

Kubectl Describe output

No response

Log output

No response

Contributing Guidelines

• I confirm that I have read the Report a Bug section of the Contributing Guidelines