Follow-up from #73597 which removed the CSVs, StaticModels, and pegasus seed.rake but left the actual database tables in place.

28 cdo_* tables remain in the pegasus database (e.g. cdo_donors, cdo_languages, cdo_partners, etc.). These are unreferenced by any code and do NOT appear in the DMS/Redshift replication config (aws/dms/tasks.yml), so no data pipeline coordination needed.

Also clean up the corresponding seed_info tracking rows — prior cleanups (migrations 084-090, 110-112, 127-128) set the precedent of deleting seed_info entries when dropping CSV-backed tables.

Write a pegasus Sequel migration to drop all 28 tables and their seed_info entries.