[fix] Add `fatal_error` to `ContinuousBatchingManager` so the serving layer can detect a dead CB worker (#45898)
* Add `fatal_error` to `ContinuousBatchingManager` so the serving layer can detect a dead CB worker
* style
* style fix
* Update utils.py
Co-authored-by: Rémi Ouazan <83456801+remi-or@users.noreply.github.com>
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Co-authored-by: Rémi Ouazan <83456801+remi-or@users.noreply.github.com>