swing-store export discard error

[mhofman]

Describe the bug

A validator hit an issue where IAVL export failed (not currently investigated). This triggered the discard logic for the swing-store export, however it seems like something goes wrong and the discard action errors, leaving the temporary folder in place.

Expected behavior

No temporary folder left behind

Platform Environment

• validator running agoric-upgrade-13 on agoric-3 mainnet

Additional context

https://discord.com/channels/585576150827532298/1191865777339498569/1193106469562880000

Screenshots

8:50AM INF executed block height=13231510 module=state num_invalid_txs=0 num_valid_txs=0
8:50AM INF Timed out dur=1000 height=13231510 module=consensus round=0 step=5
8:50AM ERR failed to create state snapshot err="failed to generate snapshot chunk 20: iavl export failed for version 13231500: version mismatch on immutable IAVL tree; version does not exist. Version has either been pruned, or is for a future block height" height=13231500
8:50AM ERR failed to discard swing-store export err=null height=13231500 module=x/swingset submodule=SwingStoreExportsHandler