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

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[vlmed]

@magento I am working on this

[m2-assistant]

Hi @vlmed. Thank you for working on this issue.
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