Rust: Update schema upgrade snapshots for AnyAttr

Refresh the generated upgrade target after attribute edges changed to AnyAttr, and rename the downgrade directory to the hash of the final schema.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot-Session: 612c2b22-3121-4c83-9656-bb0f4abb2a8a

Author: paldepind