Merge branch '386920-sso-enforcement' into 'master'

Don't enforce SSO for public groups

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/114111



Merged-by: Bogdan Denkovych <bdenkovych@gitlab.com>
Approved-by: Bogdan Denkovych <bdenkovych@gitlab.com>
Reviewed-by: Drew Blessing <drew@gitlab.com>
Reviewed-by: Jarka Košanová <jarka@gitlab.com>
Reviewed-by: Bogdan Denkovych <bdenkovych@gitlab.com>
Co-authored-by: Jarka Košanová <jarka@gitlab.com>