[Issue] Updated `\Magento\Framework\Config\Dom\UrnResolver` to also resolve URLs

[m2-assistant]

This issue is automatically created based on existing pull request: #40968: Updated \Magento\Framework\Config\Dom\UrnResolver to also resolve URLs

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Updated \Magento\Framework\Config\Dom\UrnResolver to also resolve URLs

Description (*)

Made UrnResolver::registerEntityLoader more compliant with libxml_set_external_entity_loader:

• https://www.php.net/manual/en/function.libxml-set-external-entity-loader.php

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)