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test(handlers): update tests for billing_id inference from org_id

Update test cases for ListBillingTransactions, TotalDebitedTransactions,
ListInvoices, and GetUpcomingInvoice to mock customerService and test the
new behavior where billing_id is inferred from org_id.

Changes:
- Add customerService mock to all test cases
- Update test requests to use org_id instead of billing_id
- Add test cases for when billing account is not found
- Update test struct definitions to include customerSetup function
- Update test runners to initialize customerService mock

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Co-Authored-By: Claude <noreply@anthropic.com>