Don't log raw error when quitting watch script

Description

In chore: ensure child watchers always stop (!2086 - merged) the watch script was adjusted to more reliably run abortController.abort() for child proccesses. While this ensures we don't get dangling background processes, the console output when quitting the watcher is not very nice - a raw error object is logged.

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We should handle this more gracefully and not log the full raw error