Test: Detach and attach terminal sessions

[Tyriar]

Refs: #118276

• macOS @egamma
• linux @TylerLeonhardt
• Windows @DavidKutu

Complexity: 3

Authors: @Tyriar, @meganrogge

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Previously we've had the feature to attach to remote terminal session for example in a codespace and a window was closed. This iteration we implemented manual detaching from a session and support in local windows via the command palette.

Test that it's possible to detach and reattach terminal processes in both local and remote and that you can detach in one window and reattach the terminal in a different window.

[DavidKutu]

Works on windows, both locally and remotely. Tyler's issue doesn't seem to repro on Windows.