repository: monkey patch pyro connection handling to detect clients going away
When a pyro client goes away we need to close their session (to release their
cnxset). Add a dict to the repository mapping pyro client threads to session
object.
Closes #2932058
notification: use viewargs for notif_entity_updated instead of transaction_data
Now that notifications use separate sessions, they can't rely on the
original transaction_data being around, so pass the data through view
arguments instead, so the notification view knows what changed on
updated entities.
Closes #2936180