When installing knative with GitLab managed apps. There is no service
named `knative-ingressgateway` under the `istio-system` namespace.

For example:

<details>
<summary> kubectl get svc --namespace=isito-system </summary>

```
cluster-local-gateway ClusterIP
istio-ingressgateway  LoadBalancer
istio-pilot           ClusterIP
istio-telemetry       ClusterIP
```

</details>