gateway-api: Retrieve LB service from same namespace

This commit is to add the same namespace while listing generated LB
service, the main reason is to avoid wrong status update for gateways
having the same name, but belonged to different namespace.

Testing was done locally as per below:

Before the fix:
```
$ kg gateway -A
NAMESPACE   NAME         CLASS    ADDRESS          PROGRAMMED   AGE
another     my-gateway   cilium   10.110.222.237   True         4s
default     my-gateway   cilium   10.110.222.237   True         56s
```

After the fix:

```
$ kg gateway -A
NAMESPACE   NAME         CLASS    ADDRESS          PROGRAMMED   AGE
another     my-gateway   cilium   10.102.170.180   True         14m
default     my-gateway   cilium   10.110.222.237   True         14m

$ kg services -A
NAMESPACE     NAME                           TYPE           CLUSTER-IP       EXTERNAL-IP      PORT(S)                      AGE
another       cilium-gateway-my-gateway      LoadBalancer   10.102.170.180   10.102.170.180   80:31424/TCP                 15m
default       cilium-gateway-my-gateway      LoadBalancer   10.110.222.237   10.110.222.237   80:31889/TCP                 15m
...
```

Fixes: #31270
Signed-off-by: Tam Mach <tam.mach@cilium.io>

operator/pkg/gateway-api/gateway_reconcile.go

@@ -319,7 +319,7 @@ func (r *gatewayReconciler) setAddressStatus(ctx context.Context, gw *gatewayv1.
 	svcList := &corev1.ServiceList{}
 	if err := r.Client.List(ctx, svcList, client.MatchingLabels{
 		owningGatewayLabel: model.Shorten(gw.GetName()),
-	}); err != nil {
+	}, client.InNamespace(gw.GetNamespace())); err != nil {
 		return err
 	}
 

operator/pkg/gateway-api/gateway_reconcile_test.go

@@ -40,7 +40,30 @@ var gwFixture = []client.Object{
 			Namespace: "default",
 		},
 	},
-
+	&corev1.Service{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      "cilium-gateway-valid-gateway",
+			Namespace: "another-namespace",
+			Annotations: map[string]string{
+				"pre-existing-annotation": "true",
+			},
+		},
+		Status: corev1.ServiceStatus{
+			LoadBalancer: corev1.LoadBalancerStatus{
+				Ingress: []corev1.LoadBalancerIngress{
+					{
+						IP: "10.10.10.11",
+						Ports: []corev1.PortStatus{
+							{
+								Port:     80,
+								Protocol: "TCP",
+							},
+						},
+					},
+				},
+			},
+		},
+	},
 	&corev1.Service{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:      "cilium-gateway-valid-gateway",
@@ -49,6 +72,21 @@ var gwFixture = []client.Object{
 				"pre-existing-annotation": "true",
 			},
 		},
+		Status: corev1.ServiceStatus{
+			LoadBalancer: corev1.LoadBalancerStatus{
+				Ingress: []corev1.LoadBalancerIngress{
+					{
+						IP: "10.10.10.10",
+						Ports: []corev1.PortStatus{
+							{
+								Port:     80,
+								Protocol: "TCP",
+							},
+						},
+					},
+				},
+			},
+		},
 	},
 	&corev1.Service{
 		ObjectMeta: metav1.ObjectMeta{
@@ -322,35 +360,6 @@ func Test_gatewayReconciler_Reconcile(t *testing.T) {
 		gw := &gatewayv1.Gateway{}
 		err = c.Get(context.Background(), key, gw)
 		require.NoError(t, err)
-		require.Empty(t, gw.Status.Addresses)
-
-		// Simulate LB service update
-		lb := &corev1.Service{}
-		err = c.Get(context.Background(), client.ObjectKey{Namespace: "default", Name: "cilium-gateway-valid-gateway"}, lb)
-		require.NoError(t, err)
-		require.Equal(t, corev1.ServiceTypeLoadBalancer, lb.Spec.Type)
-		require.Equal(t, "valid-gateway", lb.Labels["io.cilium.gateway/owning-gateway"])
-		require.Equal(t, "true", lb.Annotations["pre-existing-annotation"])
-
-		// Update LB status
-		lb.Status.LoadBalancer.Ingress = []corev1.LoadBalancerIngress{
-			{
-				IP: "10.10.10.10",
-				Ports: []corev1.PortStatus{
-					{
-						Port:     80,
-						Protocol: "TCP",
-					},
-				},
-			},
-		}
-		err = c.Status().Update(context.Background(), lb)
-		require.NoError(t, err)
-
-		// Perform second reconciliation
-		result, err = r.Reconcile(context.Background(), ctrl.Request{NamespacedName: key})
-		require.NoError(t, err)
-		require.Equal(t, ctrl.Result{}, result)
 
 		// Check that the gateway status has been updated
 		err = c.Get(context.Background(), key, gw)