Mike Yuan 45eea629e3 logind: support deserializing session leader through pidfdid
People make weird assumptions around state preservation and
expect logind to be stoppable. While this is realistically
not OK we can probably improve things a little.

This complements f01d8658a3 and
adds support for deserializing the LEADER_PIDFDID= field.
We still prioritize pidfd if got one from fdstore (as with
service_notify_message_parse_new_pid() in pid1), but otherwise
this should make logind restart more robust when fdstore
gets spuriously cleared.

Fixes #39437
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