groups: stop flapping
groups: stop flapping

This reverts e7045ea11e2d9e8d464a79cdaf56b18ec250367e

Google Workspace used to silently convert this gmail address to a
googlemail address, now it appears to be doing this opposite. Every
other run fails trying to add the unconverted address, and removes the
converted address.

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