Remove leftover e2e resouces due to test failure

[HaoYang0000]

@roypaulin @cchen-vertica @qindotguan @LiboYu2
In my local env, when kuttl test failed, there are leftover resources left in my cluster.
Create a make target "cleanup-e2e-env" to remove those resources and namespace.
Create a make target "cleanup-prometheus-leftover" to remove leftover resources for Prometheus.

[HaoYang0000]

Also there is Prometheus resources maybe leftover, wondering if we should add another make target or use the same one "cleanup-e2e-env":
NAMESPACE=$1
kubectl delete clusterrole prometheus-kube-prometheus-operator -n $NAMESPACE
kubectl delete clusterrole prometheus-kube-prometheus-prometheus -n $NAMESPACE
kubectl delete clusterrolebinding prometheus-kube-prometheus-operator -n $NAMESPACE
kubectl delete clusterrolebinding prometheus-kube-prometheus-prometheus -n $NAMESPACE
kubectl delete svc prometheus-kube-prometheus-kube-proxy -n kube-system
kubectl delete svc prometheus-kube-prometheus-kubelet -n kube-system
kubectl delete MutatingWebhookConfiguration prometheus-kube-prometheus-admission -n $NAMESPACE
kubectl delete ValidatingWebhookConfiguration prometheus-kube-prometheus-admission -n $NAMESPACE

[LiboYu2]

Also there is Prometheus resources maybe leftover, wondering if we should add another make target or use the same one "cleanup-e2e-env": NAMESPACE=$1 kubectl delete clusterrole prometheus-kube-prometheus-operator -n $NAMESPACE kubectl delete clusterrole prometheus-kube-prometheus-prometheus -n $NAMESPACE kubectl delete clusterrolebinding prometheus-kube-prometheus-operator -n $NAMESPACE kubectl delete clusterrolebinding prometheus-kube-prometheus-prometheus -n $NAMESPACE kubectl delete svc prometheus-kube-prometheus-kube-proxy -n kube-system kubectl delete svc prometheus-kube-prometheus-kubelet -n kube-system kubectl delete MutatingWebhookConfiguration prometheus-kube-prometheus-admission -n $NAMESPACE kubectl delete ValidatingWebhookConfiguration prometheus-kube-prometheus-admission -n $NAMESPACE

We can make it a target for makefile. Here are the commands I used on the top of the ones you posted. Some are duplicates.

[roypaulin]

This won't clean up prometheus-kube-prometheus-kube-proxy which is in kube-system.

[HaoYang0000]

Yes, here I intend to remove only kuttl-test namespace leftover resources. For the other kinds I may add another target.

[roypaulin]

Why a separate PR, just do it here!

[HaoYang0000]

No, I didn't mean another PR, I mean another make target. Deleting non-namespace scoped resources can be very destructive, for example: kubectl delete clusterrole. It will impact the Prometheus instance.