Optionalsession_expiry?: numberUnix timestamp (seconds since epoch) indicating the hard ceiling on the RP
session lifetime, as asserted by the upstream IdP via the IPSIE SL1 protocol.
Present when the IdP signals support for session expiry enforcement
(e.g. Auth0 enterprise connections with id_token_session_expiry_supported: true).
ID Token claims, extended with the IPSIE SL1 session_expiry claim.