[Forwardport] [TASK] Fix overriding of payment methods in getPaymentMethodList #15124
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Original Pull Request
#15032
Fixes Issue #13460, keeps changes from pull request #12284
Description
This fix only sets the value of a group if it doesn't already exist when calling \Magento\Payment\Helper\Data::getPaymentMethodList with parameter $withGroups = true.
Fixed Issues
#13460
#12284
Manual testing scenarios