ipam, virt: graduate persistent ips feature gate to GA

[maiqueb]

This PR graduates the PersistentIPsForVirtualization feature gate to GA.

[openshift-ci]

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: maiqueb
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[openshift-ci]

@maiqueb: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-serial-techpreview	69d8740	link	true	/test e2e-aws-serial-techpreview
ci/prow/verify	69d8740	link	true	/test verify
ci/prow/e2e-gcp	69d8740	link	false	/test e2e-gcp
ci/prow/e2e-aws-ovn-techpreview	69d8740	link	true	/test e2e-aws-ovn-techpreview
ci/prow/e2e-aws-serial	69d8740	link	true	/test e2e-aws-serial

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[openshift-merge-robot]

PR needs rebase.

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