26758 improved cms page custom layout update logic

[sergiy-v]

Description

Fixed logic for applying custom layout updates.

Fixed Issues

#26758

Manual testing scenarios

See issue description from #26758.

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)

[m2-assistant]

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[magento-engcom-team]

Hi @dmytro-ch, thank you for the review.
ENGCOM-7033 has been created to process this Pull Request

[engcom-Alfa]

✔️ QA Passed

[m2-assistant]

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