add filestore fix for multi-learn node augsta checkpointing

[saurabh111233212]

[!NOTE] Ensure checkpoint_state_dir is rewritten under /filestore when gs_bucket_path is set and the path isn’t already in filestore.

• Checkpointing:
  • When gs_bucket_path is provided (and gs_checkpoint_state_dir unset), rewrite checkpoint_state_dir to /filestore/... if it doesn't already start with /filestore, before GCS download/calibration.

^{Written by Cursor Bugbot for commit 7942a4a67980eeeba494c4872102436988858879. This will update automatically on new commits. Configure here.}

[gemini-code-assist[bot]]

Summary of Changes

Hello @saurabh111233212, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request implements a critical fix to how checkpoint directories are constructed, specifically for multi-learn node setups. It ensures that all checkpoint paths are correctly routed to the /filestore system by programmatically adding the prefix if it's missing. This change is vital for maintaining data integrity and proper recovery mechanisms during distributed training, preventing potential failures related to incorrect storage locations.

Highlights

• Checkpoint Path Correction: Introduced a conditional check to ensure that the checkpoint_state_dir is always prefixed with /filestore if it isn't already, addressing potential issues with checkpoint storage paths.
• Multi-Node Checkpointing Reliability: This fix specifically targets improving the reliability of checkpointing in multi-learn node environments, ensuring consistent storage paths for 'augusta' checkpoints.

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