Mark GraphQl, ImportExport, Indexer, Integration and LoginAsCustomer interfaces as API

[sivaschenko]

The following interfaces should be marked as API in 2.4-develop branch

1. app/code/Magento/GraphQl/Controller/HttpHeaderProcessorInterface.php
2. app/code/Magento/GraphQl/Controller/HttpRequestValidatorInterface.php
3. app/code/Magento/GraphQl/Model/Query/ContextInterface.php
4. app/code/Magento/GraphQl/Model/Query/ContextParametersInterface.php
5. app/code/Magento/GraphQl/Model/Query/ContextParametersProcessorInterface.php
6. app/code/Magento/ImportExport/Api/Data/ExtendedExportInfoInterface.php
7. app/code/Magento/ImportExport/Model/Report/ReportProcessorInterface.php
8. app/code/Magento/Indexer/Model/ModeSwitcherInterface.php
9. app/code/Magento/Indexer/Model/Source/DataInterface.php
10. app/code/Magento/Integration/Model/Oauth/Token/RequestLog/ReaderInterface.php
11. app/code/Magento/Integration/Model/Oauth/Token/RequestLog/WriterInterface.php
12. app/code/Magento/LoginAsCustomerApi/Api/Data/IsLoginAsCustomerEnabledForCustomerResultInterface.php
13. app/code/Magento/LoginAsCustomerApi/Api/GetLoggedAsCustomerAdminIdInterface.php
14. app/code/Magento/LoginAsCustomerApi/Api/GetLoggedAsCustomerCustomerIdInterface.php
15. app/code/Magento/LoginAsCustomerApi/Api/IsLoginAsCustomerEnabledForCustomerInterface.php
16. app/code/Magento/LoginAsCustomerApi/Api/SetLoggedAsCustomerAdminIdInterface.php
17. app/code/Magento/LoginAsCustomerApi/Api/SetLoggedAsCustomerCustomerIdInterface.php
18. app/code/Magento/LoginAsCustomerAssistance/Api/ConfigInterface.php
19. app/code/Magento/LoginAsCustomerAssistance/Api/IsAssistanceEnabledInterface.php
20. app/code/Magento/LoginAsCustomerAssistance/Api/SetAssistanceInterface.php

[m2-assistant]

Hi @sivaschenko. Thank you for your report.
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[Usik2203]

@magento I am working on this