Detection of a broken pipe is not automatic on macOS

[daxian-dbw]

Summary of the new feature / enhancement

On macOS, when you run Start-Aish to open up the sidecar, then exit from AISH and exit that sidecar pane, and run Start-Aish again, it will fail with the error "A connected channel already exists".

On Windows, the second Start-Aish will succeed as expected. This is because when AISH exit, the pipe can detect its status to be broken automatically on Windows, but not so on macOS.

Need to find better way to detect pipe status on macOS.

Proposed technical implementation details (optional)

No response