ssh remoting: Show error if opening connection timed out (#18401)

This shows an error if opening a connection to a remote host didn't work
in the timeout of 10s (maybe we'll need to make that configurable in the
future? for now it seems fine.)

![screenshot-2024-09-26-18 01
07@2x](https://github.com/user-attachments/assets/cbfa0e9f-9c29-4b6c-bade-07fdd7393c9d)


Release Notes:

- N/A

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Co-authored-by: Bennet <bennet@zed.dev>
Co-authored-by: Conrad <conrad@zed.dev>