Runs WebFinger domain discovery for the given email domain against the
Auth0 domain configured on the Auth0Provider. Returns true only if
the domain is managed by Auth0 for enterprise SSO. A routing hint, not a
security control: it returns false on any failure.
Starts the enterprise SSO redirect, passing the email as login_hint
so Home Realm Discovery can resolve the connection and organization. Any
authorizationParams supplied by the caller are preserved.
The shape returned by the
useEnterpriseConnecthook.