Show commands available to an observer within a moderated session

[russjones]

Moderated Sessions supports join_sessions functionality which allows a user to join a session and view what is happening without the ability to terminate the session. Within the role, it's the auditor mode as outlined in the documentation.

kind: role
metadata:
  name: auditor
version: v7
spec:
  allow:
    join_sessions:
      - name: Join prod sessions
        roles : ['prod-access']
        kinds: ['k8s', 'ssh']
        modes: ['moderator', 'observer']

Customer has requested that Teleport show the command that are available to the observer when they join a session similar to what Teleport does for a require_session_join session. Something like below.

Teleport > Creating session with ID: 00000000-0000-0000-0000-000000000000...
Teleport > Controls
  - CTRL-C: Leave the session
Teleport > User foo joined the session with participant mode: observer.
Teleport > Connecting to server01 over ssh
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