Refactor: Remove deprecated methods

[andrewbess]

Description (*)

Code cleanup. Deprecated methods were removed.

1. Deprecated method "loadConfigFile" has removed from "Magento\Framework\App\DeploymentConfig\Reader"

Fixed Issues (if relevant)

1. Nope

Manual testing scenarios (*)

1. Nope

Questions or comments

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 are green)

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[pmclain]

@andrewbess Thanks for the PR. I'm getting in touch with the rest of the community engineering team to discuss the general strategy for deprecated code removal.

[magento-engcom-team]

Hi @pmclain, thank you for the review.
ENGCOM-6506 has been created to process this Pull Request

[engcom-Charlie]

✔️ QA Passed

[m2-assistant]

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