e2e: take vm pool scale tests out of quarantine
e2e: take vm pool scale tests out of quarantine

according to Testgrid these tests were passing the periodic
lanes for a couple of weeks, hence taking them back as they
proved to be stable.

Signed-off-by: Igor Bezukh <9113621149c2d8e5a2b31fa2465615555ce2087b@redhat.com>

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