Use pspreference to fetch adyen payment

[jasperP98]

Summary

In the \Adyen\Shopware\ScheduledTask\Webhook\RefundWebhookHandler::handleSuccessfulNotification you try to fetch the adyen payment by its original reference but this function \Adyen\Shopware\Service\AdyenPaymentService::getAdyenPayment will try to search this via the pspreference.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[AndreasA]

would this fix #564 ?

[sneakyvv]

We're not really sure what the original PSP reference is or when it might differ from the psp reference field, but I guess you guys would know, right?

Either way, this fixes our issue as we're noticing that transactions CAN be found with the psp reference while they CANNOT be found with the original reference, so it seems like an obvious fix, but the deeper WHY is not clear.