Remove old redis keys for agent id

MR: Remove old redis key for tunnels by agent id (!2608 - merged)

Description

In Add new redis keys for agent key (#706 - closed) , we added new redis key for agent key. Once changes have been rolled out, we should delete the old redis keys. These deleted redis keys holds details about the agent id and their connection details.

Acceptance criteria

• Remove old redis keys for agent id

Implementation plan

N.A.