HttpRoute creates upstream with `server unix:/var/run/nginx/nginx-503-server.sock` and throws 503 error

HttpRoute creates upstream with `server unix:/var/run/nginx/nginx-503-server.sock` and throws 503 error


**To Reproduce**

1.install nginx-gateway:
```
kubectl apply -f https://raw.githubusercontent.com/nginx/nginx-gateway-fabric/v1.5.1/deploy/crds.yaml
kubectl apply -f https://raw.githubusercontent.com/nginx/nginx-gateway-fabric/v1.5.1/deploy/nodeport/deploy.yaml
```

2. Create NodePort Service

```yaml
apiVersion: v1
kind: Service
metadata:
  name: ufo-service
  namespace: ufo-ns
spec:
  type: NodePort
  selector:
    app: ufo-app
  ports:
    - protocol: TCP
      name: http
      port: 80
      targetPort: 8000  # inside container

      nodePort: 30007
```

3. And HttpRoute

```yaml
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  namespace: ufo-ns
  name: ufo-httproute
spec:
  parentRefs:
  - name: ufo-gateway
  rules:
  - matches:
    - path:
        type: PathPrefix
        value: /lol
    backendRefs:
    - name: ufo-service
      port: 80
```

4. check that service itself can be successfuly accessed on that node port: `curl http://vybory.live:30007` returns http 200.

5. Attempt to access the service via nginx-gateway, notice it throws http 503:
```
$ curl http://vybory.live/lol

<html>
<head><title>503 Service Temporarily Unavailable</title></head>
<body>
<center><h1>503 Service Temporarily Unavailable</h1></center>
<hr><center>nginx</center>
</body>
</html>

```

6. log into nginx caontainer with
```
kubectl exec -it --namespace nginx-gateway deployments/nginx-gateway -c nginx -- /bin/sh
```

7.  retrieve generated configuration with `nginx -T` and notice that `upstream` definition for my `ufo-service` points to `server unix:/var/run/nginx/nginx-503-server.sock;` instead of actual service ip:

```
upstream ufo-ns_ufo-service_80 {
    random two least_conn;
    zone ufo-ns_ufo-service_80 512k;

    server unix:/var/run/nginx/nginx-503-server.sock;
}

upstream ufo-ns_grafana_3000 {
    random two least_conn;
    zone ufo-ns_grafana_3000 512k;

    server 10.20.15.122:3000;
}
```

8. Also notice that at the same time, grafana `upstream` correctly references its service ip, and can be accesed via http://grafana.vybory.live

See full nginx config: https://gist.github.com/Fak3/73abc3e2b0bdbe6c38f13c62dbc09531


**Expected behavior**
Expected: the upstream definition int the config should reference service by ip, instead of pointing to `unix:/var/run/nginx/nginx-503-server.sock` 


**Your environment**
* Version of the NGINX Gateway Fabric - 1.5.1
* Version of Kubernetes: 1.29.6
* Kubernetes platform: spot.rackspace.com
* Details on how you expose the NGINX Gateway Fabric Pod : NodePort
* Logs of NGINX container: https://gist.github.com/Fak3/7bc35f3cecd38aee415046661f7982be
* NGINX Configuration: https://gist.github.com/Fak3/73abc3e2b0bdbe6c38f13c62dbc09531


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HttpRoute creates upstream with `server unix:/var/run/nginx/nginx-503-server.sock` and throws 503 error #3139

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HttpRoute creates upstream with server unix:/var/run/nginx/nginx-503-server.sock and throws 503 error #3139

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HttpRoute creates upstream with `server unix:/var/run/nginx/nginx-503-server.sock` and throws 503 error #3139