Updates AsyncCheckpointSaverHook so it does save a checkpoint when the global step is zero. This is the behavior of the synchronous checkpoint saver, so I think it's what users expect.
Updates AsyncCheckpointSaverHook so it does save a checkpoint when the global step is zero.
This is the behavior of the synchronous checkpoint saver, so I think it's what users expect.

PiperOrigin-RevId: 236765737

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