Uninstall ECK

To uninstall the operator:

Remove all Elastic resources in all namespaces:
```
kubectl get namespaces --no-headers -o custom-columns=:metadata.name \
  | xargs -n1 kubectl delete elastic --all -n
```
This deletes all underlying Elastic Stack resources, including their Pods, Secrets, Services, and so on.

Uninstall the operator:

kubectl delete -f https://download.elastic.co/downloads/eck/2.16.0/operator.yaml
kubectl delete -f https://download.elastic.co/downloads/eck/2.16.0/crds.yaml

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