AI update based on proto changes

[viambot]

This is an AI-generated PR to update the SDK based on proto changes. The AI may make mistakes so review carefully.

Summary of Changes:
This change introduces support for US Bank Accounts as a payment method within the billing system.

The Protobuf definitions (billing_pb.d.ts and billing_pb.js) have been updated to:

• Add a PAYMENT_METHOD_TYPE_USBANKACCOUNT enum value.
• Define new messages VerificationInfo and PaymentMethodUSBankAccount.
• Add an optional method_us_bank_account field to the GetOrgBillingInformationResponse.

Correspondingly, the client-side tests (billing-client.spec.ts) have been updated with new test data and assertions to cover scenarios involving the US bank account payment method.

[atlassian]

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