Mark Exceptions as API

[sivaschenko]

The follwoing Exceptions should be marked as API in 2.4-develop branch

1. app/code/Magento/Checkout/Api/Exception/PaymentProcessingRateLimitExceededException.php
2. app/code/Magento/SalesRule/Api/Exception/CodeRequestLimitException.php

[m2-assistant]

Hi @sivaschenko. Thank you for your report.
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Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento give me 2.4-develop instance - upcoming 2.4.x release

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Please, add a comment to assign the issue: @magento I am working on this

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[vlmed]

@magento I am working on this