when running prepare_helm_release.sh for generating token in kubernetes, a extra \r is introduced into the tokens

[soyji]

Describe the bug
While deploying the helm chart in kubernetes, in the preparation it guides you to run
./scripts/pulsar/prepare_helm_release.sh -n <k8s-namespace> -k <helm-release-name>

However, after running it. If you do kubectl get secret -n pulsar pulsar-token-admin -o yaml and try to decode the base64, the secret will appear trimmed. This is because a \r has been introduced.

To Reproduce
Run as the docs states:

git clone https://github.com/apache/pulsar-helm-chart
cd pulsar-helm-chart
./scripts/pulsar/prepare_helm_release.sh -n <k8s-namespace> -k <helm-release-name>

# Then do the following
kubectl get secret -n pulsar pulsar-token-admin -o yaml

# Copy paste the TOKEN: value. Then decode it, it will appear trimmed
echo "(TOKEN value)" | base64 -d

# For extra verification you can check also the octal values, you will see the \r
kubectl get secret pulsar-token-admin -n pulsar -o jsonpath='{.data.TOKEN}' | base64 -d | od -c | tail -3

The impact of this is that when mounting it into Dekaf or trying to mount it into a service for a kubernetes communication, the authentication will fail

Expected behavior
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[soyji]

For this I have created the following fix, could you check pls? #661