### Motivation
While making use of the scripts provided in this repo to prepare helm releases, I noticed that providing the ```-d``` flag (delete namespace) for the ```./scripts/pulsar/cleanup_helm_release.sh``` would always fail claiming that the **namespace already exists**. Upon closer examination, I noticed that the kubectl command to delete the provided namespace is actually attempting to create it instead.
### Modifications
I've gone ahead and made the corresponding modification on the script to delete the namespace (went from ```kubectl create namespace ${namespace}``` to ```kubectl delete namespace ${namespace}```).
### Verifying this change
I'm not sure what possible verifications I can provide for this PR. Please advise.
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