Removal of sed patch from pss_test.yaml

[biswajit-9776]

Pull Request Template for Kubeflow manifests Issues

✏️ A brief description of the changes

I removed the sed patch to istio-init conatiner in pss_test.yaml workflow

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✅ Contributor checklist

• Make sure you have tested with kustomize. See Installation Prerequisites
• All the commits have been signed-off (To pass the DCO check)

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