Remove unused Session code in the worker

Description

We previously had explicit session heartbeats from the client which were collected as SessionInfos on the worker. After we switched to only using Netty between client and worker, the session logic came for free in the form of the netty channel heartbeat. We should remove all the session logic as it is unused.

Environment

None

Status

Assignee

Bin Fan

Reporter

Calvin Jia

Labels

None

Components

Affects versions

Priority

Major
Configure