Remove DCO from prow

[rajibmitra]

See the main issue here #585 (comment)
This is a child task to remove the DCO from the Prow.

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[petr-muller]

/hold

I agree we should shed this but I'd like to deprecate -> announce -> wait -> remove, and take a bit of care to not recklessly break Prow instance that still has this enabled. Ideally we decide how exactly to proceed for all removals in the parent issue ( #585 (comment) )