Add shell uniqueness detection

[michaeljguarino]

Summary

Some terminal session managers behave strangely when there are too many clients contending for a session, this should add relatively robust checks for that. There are a few cases:

1. A websocket networks to a running channel process in-cluster, in that case we should detect it already has a wss established and not connect again.
2. A websocket creates an entirely fresh channel somewhere in-cluster and there's already a live process elsewhere, we can rpc to that node check if its alive, then bail if so.
3. A websocket creates a fresh channel, but the adjacent process has died. We will detect this by either seeing its node died or an rpc to a live node w/o that process fails to see the process there.

Also added a feature gate like we have for sysbox to test end-to-end

Test Plan

some unit tests, need end to end tests to really verify though

Checklist

• [ ] If required, I have updated the Plural documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] I have added a meaningful title and summary to convey the impact of this PR to a user.
• [ ] I have added relevant labels to this PR to help with categorization for release notes.

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