mds: persist session auth_name in ESession journal event

So that it can be applied to the freshly creation session which happens
while recreating session in ESession::replay when the OMAP version fell
behind the ESession cmapv and the newly creation session would be
rejected as target when a client tries to reclaim this session.

Fixes: https://tracker.ceph.com/issues/76728
Signed-off-by: Dhairya Parmar <dparmar@redhat.com>