[TASK] Create VAT code setup helpers - Prerequisites and Test Data Setup

[africanitem]

Task Details

Epic: #491 [EPIC] Prerequisites and Test Data Setup Workflow E2E Tests

Dependencies

• Depends on: [TASK] Create test user setup helpers - Prerequisites and Test Data Setup #493

Success Criteria

• Helper functions in e2e/helpers/vat-helpers.ts
• setupVATCodes() function for VAT code initialization
• Functions verify VAT codes exist before creating transactions