groups: cleanup sig-k8s-infra google groups
groups: cleanup sig-k8s-infra google groups

Cleanup google groups as followup of WG conversion.

Signed-off-by: Arnaud Meukam <96190fcd0798f0afa72279990e31ddc33e4f2ea2@gmail.com>

kubernetes/k8s.io,kubernetes/k8s.io,kubernetes/k8s.io,kubernetes/k8s.io