Remove test_id:4621 from quarantine (fixed in #6312)
Remove test_id:4621 from quarantine (fixed in #6312)

This test hasn't failed in the k8s-1.21-sig-storage periodics
and therefore we think it is no longer flaky.
(The other sig-storage lanes are known as flaky and not taken
into account)

Signed-off-by: Maya Rashish <309f5d63d2311d00fe13deb09dd851fb2714413c@redhat.com>

kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt