Auto merge of #18281 - darichey:async-subprocess, r=lnicola

Run subprocesses async in vscode extension

Extensions should not block the vscode extension host. Replace uses of `spawnSync` with `spawnAsync`, a convenience wrapper around `spawn`.

These `spawnSync`s are unlikely to cause a real issue in practice, because they spawn very short-lived processes, so we aren't blocking for very long. That said, blocking the extension host is poor practice, and if they _do_ block for too long for whatever reason, vscode becomes useless.

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