prow: Remove deployment to the old workloads cluster

[brianmcarey]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
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/cc @dhiller

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Release note:

[kubevirt-bot]

PR needs rebase.

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[dhiller]

/approve

[kubevirt-bot]

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