Saved model: Block waiting for checkpoint save operations to complete before writing saved_model.pb
Saved model: Block waiting for checkpoint save operations to complete before writing saved_model.pb

Ensures that there's a way to check for a complete SavedModel even when running async eager.

PiperOrigin-RevId: 299158308
Change-Id: Ia41d5373eb495b795633ea64bf6eeac3b773b44d

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