[cern] Make dual_stack an opt-out feature

Spyridon Trigazis requested to merge ipv6-opt-out into cern/train
  • add ip_family_policy which defaults to dual_stack
  • expose portal_network6_cidr,pods_network6_cidr as a labels keeping the same default cidr
  • drop EndpointSlice, IPv6DualStack which are True anyway since 1.18 and 1.21 respectively

closes https://gitlab.cern.ch/kubernetes/project/-/issues/300

Signed-off-by: Spyros Trigazis spyridon.trigazis@cern.ch

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