Replace cleartext creds to secrets in sample manifests

[sarab97]

Fixes #29455

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[MaxHorstmann]

@dims @sarab97 hi, still planning on merging this?

Note also https://github.com/kubernetes/test-infra/pull/29935

[sarab97]

oh yes @MaxHorstmann. Still waiting on reply from @dims. I followed the currently implemented approach. However the PR you linked does suggest better approach Im open to work to implement that here as well. @dims can you comment?

[MaxHorstmann]

@sarab97 thanks for your response! fyi #29935 now merged.

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