Use helper functions for CheckpointManager operations. - #4383
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Refactors code to interact with the CheckpointManager through dedicated helper functions instead of direct method calls. This is necessary because: - The underlying CheckpointManager operations (`.wait_until_finished`, `.latest_step`, `.reached_preemption`) have different semantics in v1 compared to v0. - We need to ensure the v0 emergency checkpointer functionality remains intact. This abstraction layer isolates the core logic from the specific CheckpointManager version PiperOrigin-RevId: 953793325
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Use helper functions for CheckpointManager operations.
Refactors code to interact with the CheckpointManager through dedicated helper functions instead of direct method calls. This is necessary because:
.wait_until_finished,.latest_step,.reached_preemption) have different semantics in v1 compared to v0.This abstraction layer isolates the core logic from the specific CheckpointManager version