Orphan cleanup built its referenced set from snapshot manifests plus the
current and previous metadata files, then walked all of metadata/ and
data/. Table statistics (Puffin) and partition statistics files are
listed in the table metadata's statistics and partition-statistics
lists, not in any snapshot, so once they passed the safety window
remove_orphans deleted them while the metadata still pointed at them.
Mark the files in both lists referenced as well.
Generated with [Devin](https://devin.ai)
Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>