6942-keycloak-allow-logout-to-work-with-version-18

• Need !1158 (merged) to be merged before merging this one.
• Now we get the logout endpoint using the end_session_endpoint variable at the .well-known/openid-configuration endpoint.
• This merge request fix the logout for newer versions of keycloak using the new parameters post_logout_redirect_uri and client_id or id_token_hint.