currently only SSO available for Team Edition is GitLab
as per the documentation google single sign on is only available on E20
Google Single Sign-On Available in Enterprise Edition E20 When enabled by your System Admin, you can sign in using your Google account using a one-click sign in option.
Any possibility for this to move to Team edition as well in future.
We don’t have this feature on the team edition roadmap any time in the near future but you’re welcome to add a feature suggestion to our forum where it can be upvoted by yourself and others.
Please consider adding it to E10, then. This single feature is prompting discussion on our end regarding the need to upgrade to E20. That’s a substantial jump for what is actually a pretty simple feature.