Fix `hf jobs` commands crashing without a TTY (#3782)
Use `shutil.get_terminal_size()` instead of `os.get_terminal_size()` in
`_tabulate` so that commands like `hf jobs hardware` and `hf jobs scheduled ps`
gracefully fall back to a default terminal width when no TTY is attached
(e.g. piped output, subprocesses).
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
