Test: SSH with socket

[roblourens]

Refs: #3234

• anyOS @aeschli Windows -> Linux
• windows @rebornix

Complexity: 3

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• The OS above refers to the client version. Please one tester test with a mac server (you can test mac -> localhost) and one with a linux server. A windows server doesn't support this feature.
• Set remote.SSH.remoteServerListenOnSocket
  • If you already had an active connection to that server before setting that setting, you must force the server to restart by running "Kill VS Code Server on Host..."
• Connect to your server
  • Note: Depending on your setup, you may be asked for the remote platform since "local server" mode isn't supported with this setting, that's ok.
• Check that you are properly connected, you can open terminals and files and so on
• Check that it did use a socket when connecting - open the output channel "Remote-SSH" and look for a line that should look something like
  Spawning tunnel with: ssh -T -L 127.0.0.1:52591:<some path on the remote filesystem here>

If you file any issues, include that full log