Custom drain implementation

[alicefr]

The controller currently uses k8s.io/kubectl/pkg/drain for node draining, which pulls in heavy dependencies for a fairly thin orchestration layer on top of the Eviction API (list pods, filter DaemonSet/mirror pods, evict with PDB retry, poll until deleted). A custom implementation would drop k8s.io/kubectl and k8s.io/cli-runtime and use the Eviction API directly. This should allow dropping the logwriter adapter we have, and possibly not require drain goroutines.

Issue originally reported by @jlebon in https://github.com/bootc-dev/bootc-operator/blob/main/docs/ARCHITECTURE.md

[jlebon]

I investigated this during the implementation phase. At this point I don't think this is worth doing, but we can revisit in the future.