Test: Add a Conway test for updating the constitution

[sgillespie]

Description

This change adds more tests from #1572. We're adding the following test cases:

• Treasure withdrawals
• Update constitution

Checklist

• [x] Commit sequence broadly makes sense
• [x] Commits have useful messages
• [x] New tests are added if needed and existing tests are updated
• [ ] Any changes are noted in the changelog
• [x] Code is formatted with fourmolu on version 0.10.1.0 (which can be run with scripts/fourmolize.sh)
• [x] Self-reviewed the diff

Migrations

• [ ] The pr causes a breaking change of type a,b or c
• [ ] If there is a breaking change, the pr includes a database migration and/or a fix process for old values, so that upgrade is possible
• [ ] Resyncing and running the migrations provided will result in the same database semantically

If there is a breaking change, especially a big one, please add a justification here. Please elaborate more what the migration achieves, what it cannot achieve or why a migration is not possible.