56 - Improved log-out for single sign-on users

For those using SSO, previously a log out of Concentric wasn’t triggering a log out of the SSO session (which might be being used by more than 1 application), meaning that it was possible to re-login to Concentric without re-entering credentials. This can cause issues particularly on shared devices. On log-out of Concentric, if signed in using SSO, we now redirect to the SSO provider’s log-out page where the user can confirm whether they do indeed mean to log out of their SSO session.