feat: add gateway-api support

[l0wl3vel]

Description

• Add kind-cloud-controller-manager to provide Type: Loadbalancer services
• Introduce envoy-gateway as the Gateway API implementation
• Move metal-stack control plane kind cluster into the mini_lab_external docker network
  • can't select container IP in the default docker bridge, which we need for the pre-defined *.nip.io DNS records
• Kept ingress-nginx for now. Still required for Dex, Thanos, Gardener, PowerDNS

WIPs

• Certificates are a bit messed up still (using default-gateway cert for grcp termination)

Used AI-Tools ✨

• TOOL used for generation

Closes: #297

Requires: metal-stack/helm-charts#156 and metal-stack/metal-roles#594

Tested configurations

• Sonic
• Dell Sonic (broken/abandoned, right? @ma-hartma)
• Gardener (looks good, deploys correctly with metal-stack on GWAPI and Gardener components still on ingress-nginx, further testing required)
• Kamaji
  • non-functional. So likely a wontfix, unless it gets integreated into mini-lab. Only usable in capi-lab, which uses an old pinned version of mini-lab.