github: Replace minikube with kind in CI

[skoeva]

This change replaces the use of minikube in the Build Container and test / build discover and deploy workflow with the use of kind. We estimate 60% decrease in run time on a cold run for the "Start Cluster" step of 1 minute (from ~1m50s to ~45s). Even with a cached image for the minikube run, we estimate a 25% decrease in run time (from ~1m to ~45s). This should speed up CI workflows for future changes.

Fixes: #1746

Testing

• [ ] Run Build Container workflow locally and ensure tests pass
• [ ] Build Headlamp images in a local kind cluster
• [ ] Apply deployment manifests and configure Headlamp credentials
• [ ] Run e2e playwright tests against the local Headlamp instance

[illume]

Nice work, I see it's faster with starting the cluster. I also see some things are cached.

kind

minikube