Enable ValidatingAdmissionPolicy featureGate by default

Francois Eleouetrequested to merge
validating-admission-policy into main

What does this MR do and why?

Enable ValidatingAdmissionPolicy featureGate in for Sylva 1.2.x, in order to be able to use ValidatingAdmissionPolicy in Sylva 1.3 release

Related reference(s)

Closes #1877 (closed)

Edited by Thomas Morin

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