fix(Session): Revert commit for #5209 (refs #5291)

Revert dde6a7d85e590542a57d32c67d80cdc57ad0c588
fix(Session): Add sendCookie to Session constructor (refs #5291)

The $sendCookie argument permit the creation of a session without
sending any cookies to the client. This is mainly useful for the
openAuthenticator (for which we explicitly prohibit cookies to be sent
(see #5209)).
fix(Session): Add getAuthSession() to openAuthenticator class (refs #52291)

Pre-open a session with $sendCookie = false in openAuthenticator to
prevent sending cookies to the client (see #5209).