fix: Fail scan on InvalidMagicError in picklescan, update default for… #7381
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… read_checkpoint_meta to scan unless explicitly told not to
Summary
Update our picklescan usage to no longer ignore scan errors.
Update read_checkpoint_meta in model_util.py to default to running scans
QA Instructions
Corrupt a ckpt file and scan it. Ensure it fails scanning in the probe.
Merge Plan
Can be merged when approved
Checklist
What's New
copy (if doing a release after this PR)