[PW-6998] Review refundOrder function

[RokPopov]

Description The purpose behind this PR is to update what we do in Helper\Order::refundOrder. Instead of using $notification->getOriginalReference() to check if it's a partial payment, we are switching to using the entries in the adyen_order_payment table and making sure that adyen_order_payment is found before calling registerRefundNotification() in the other if block.

Tested scenarios

• successful full and partial refund scenarios

[sonarqubecloud[bot]]

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