Do not require ingress-controller for Gardener setup.

[Gerrit91]

Description

Follow-up of #299.

• The kind-cloud-controller-manager did not fully work as it was not possible to run readiness probes against the spawned envoy proxy containers and therefore it did not patch the service status. Running it in the host network resolved this problem.
• A mutating webhook was added to allow static IPs for the services' type load balancer created by Gardener, dynamically retrieving the correct IPs with .nip.io is really hard to do.
• All mini-lab status patching workarounds are now gone.
• Now we also see issues with Netpols for minio as we did for other extensions in the past, too. Here is the PR to deploy them automatically: Allow accessing S3 service inside the Garden Cluster. gardener-extension-backup-s3#31

Used AI-Tools ✨

• None used for generation