Redirect Group Managed Accounts to the SSO URL on sign out
Problem
Group SSO users need to use their group's SSO page to get access to that group. Currently signing out takes them to the generic /users/sign_in
page which only offers password sign in. This is confusing to users who have not been using a password, can lead to them entering their SSO password, and can lead to them signing in with a password only to not have access.
Instead we should have a user flow that allows them to sign in with their group's SSO again.
Proposal
When a group managed account signs out from GitLab, redirect the user to the SSO URL that corresponds to their group.
Edited by Jeremy Watson (ex-GitLab)