WIP: update external secrets from the shared ES account secret-manager

[Priyankasaggu11929]

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[Priyankasaggu11929]

@rajaskakodkar Need help understanding how to test this updated External Secrets file?

If I apply the manifest in the current Prow PoC cluster, it would check for the secrets in the ES account secret-manager? Or I need to follow some more steps to point the current cluster to the new secret-manager?

[rajaskakodkar]

@Priyankasaggu11929 In this PR you have touched external-secrets.yaml and kubernetes-external-secrets-sa.yaml. One way to test this is apply all the untouched kubernetes-external-secrets*.yaml from https://github.com/rajaskakodkar/tanzu-test-infra/tree/main/config/prow + the files you have touched in this PR. All the secrets mentioned in external-secrets.yaml should be created in the cluster where you apply these files.