fix: eligibility rules

[mdiapenabc]

Description

Fixes several bugs in the eligibility decision tree

• Step 2 to Step 8 transition
• Step 9 missing the null csa_status check
• Timezone issues

How to Test

# Install dependencies
npm install && cd backend && npm install

# Run tests (should all pass — no new service logic yet)
cd backend && npm run test

# Verify migration applies cleanly (requires local Postgres)
Run migration: docker compose down -v & docker compose up 
Run data ingestion: npm run job:data-ingestion

[saifrazabc]

Approving for eligibility rules & date format fixies.