Defines different prompt behaviour for interactive login.

• Login - Will force the user to enter their credentials on that request, negating single-sign on.
• Consent - Will the trigger the OAuth consent dialog after the user signs in, asking the user to grant permissions to the app.
• SelectAccount - Will interrupt single sign-on providing account selection experience listing all the accounts in session or any remembered accounts or an option to choose to use a different account.
• None - Will ensure that the user isn't presented with any interactive prompt. if request can't be completed via single-sign on, the login process will fail.