Feature: device flow redirects the user to IdP login if the client app only connects to one connection
Description: If there is only one connection connected to the client application, the login screen should redirect the user to the connection IdP directly instead of asking the user to click the connection button.
Use-case: We have one dedicated application used by the CLI user to authenticate to our service. And there is only one SAML connection connected to this application. Every time the device code is verified, the user is redirected to a login screen with only one connection button shown in it, and the user has always to click that button to be redirected to the only IdP connection to continue login.