[Backport] Fix issue causing attribute not loading when using getList

[GovindaSharma]

Original Pull Request

#19620

Description (*)

As specified in issue #17759, CustomerRepository::getList() is unexpectedly returning NULL, when CustomerRepository::get() is correctly returning the value. Specifying the attribute as billing_company instead of company removes the conflict.

Fixed Issues (if relevant)

1. M2.2.5 : CustomerRepository::getList() does not load custom attribute if the name is "company" #17759: M2.2.5 : CustomerRepository::getList() does not load custom attribute if the name is "company"

Manual testing scenarios (*)

1. Create/Install two custom varchar customer attributes, one with the code company.
2. Log the data when loading with getbyId():
   $customerById = $customerRepository->getbyId(x);
3. Log the data when loading with getList():
   $customerByList = $customerRepository->getList($searchCriteria->addFilter('x, y')->create());

Previously, under custom attributes, both attributes were loading correctly for getbyId(), but company would pull NULL when using getList()

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @GovindaSharma. Thank you for your contribution
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[magento-engcom-team]

Hi @sidolov, thank you for the review.
ENGCOM-3868 has been created to process this Pull Request

[ghost]

Hi @GovindaSharma, thank you for your contribution!
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[magento-engcom-team]

Hi @GovindaSharma. Thank you for your contribution.
We will aim to release these changes as part of 2.2.8.
Please check the release notes for final confirmation.

Please, consider to port this solution to 2.3 release line.
You may use Porting tool to port commits automatically.