Mention load balancing / ingress / Gateway API for Production Environment page

**This is a Feature Request**

**What would you like to be added**
Amend https://kubernetes.io/docs/setup/production-environment/ to mention the need for load balancing _for workloads_ (not just the API server). Suggest that the best solutions are external projects; link pages with suggestions:
- https://kubernetes.io/docs/concepts/services-networking/ingress-controllers/
- a slightly revised version of https://kubernetes.io/docs/tasks/access-application-cluster/create-external-load-balancer/ that also mentions on-premises options such as https://metallb.universe.tf/ - with a third party warning shortcode (see the ingress controllers page for an example)

**Why is this needed**
Readers might want to know how to set up a cluster with load balancing implemented in a resilient and scalable way.

**Comments**
/language en
Prompted by https://github.com/kubernetes/website/issues/28057