[XBAP-19700] Update BatchPayments endpoint responses

[natdebarbieri]

Description

Adds the following fields in the example BatchPayments responses:

• BatchPayment.Account.CurrencyCode
• BatchPayment.Payments[].Invoice.CurrencyCode
• BatchPayment.Payments[].BankAmount

Consumers of the BatchPayments API may receive FX BatchPayments—originating from other parts of Xero—without any way to identify them as such. In coordination with this PR, we are going to be releasing a change to populate the mentioned FX fields in the responses.
This PR updates the example responses to include those FX fields. The fields themselves already exist in the Account, Payment and Invoice objects, so the SDK is already equipped to handle this information.

Release Notes

Adds FX fields to example responses in the BatchPayments endpoints.

Screenshots (if appropriate):

More in https://xero.atlassian.net/browse/XBAP-21152?focusedCommentId=2518540

Types of Changes

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

[github-actions]

PETOSS-748

[github-actions]

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