Fix notion connection

[drcongo]

• [x] ensure access to relevant DBs
• [x] regenerate test data
• [x] update header checks
• [x] remap Notion keys
• [x] add new sync task for the new DB
• [x] rewrite tests for new structure
• [x] re-enable the integrity check cron on production once deployed

[StephenAbbott]

Signed off ✅