[Feature flag] Make enforced Group SSO generally available
What
Remove the :enforced_sso feature flag when we'd like to make it GA.
Steps
-
Test sign in flows on staging with test group -
Test sign in flows on GitLab.com with test group -
Update and improve Group SAML documentation -
Test with beta customers on GitLab.com -
Increase coverage of QA/feature tests -
Security review -
Security fixes merged if needed -
Remove feature flag and add changelog entry