[BUG] : [ACI] add paymentBrand to the card payment request

[AkshayaFoiger]

🐞 Bug Report

Description

ACI has made the paymentBrand field in their Payments API mandatory. Currently, Hyperswitch does not send this value, resulting in failures when processing card payments.

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Expected Behavior

Hyperswitch should populate and send the paymentBrand field to ACI based on the detected card brand.

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Actual Behavior

The paymentBrand field is not sent to ACI, which causes the connector to return the error:

Field is paymentBrand and the message is may not be null

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Steps To Reproduce

1. Attempt a card payment through the ACI connector.
2. Observe the request payload — note that paymentBrand is missing.
3. Observe the response error from ACI indicating the missing field.

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Checks

• I searched existing issues and did not find a duplicate.
• I have read the [Contributing Guidelines](https://github.com/juspay/hyperswitch/blob/main/docs/CONTRIBUTING.md).