feat: make Elementor's Page Content widget available to Custom Layouts

[HardeepAsrani]

Summary

This PR makes Elementor's Page Content widget available to Custom Layouts post type.

Will affect visual aspect of the product

YES/NO

Screenshots

Test instructions

• Make sure if you create a Custom Layout using Elementor, you see the Post Content widget available when using Elementor Pro.
• Make sure it works properly.

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes https://github.com/Codeinwp/neve-pro-addon/issues/3058.

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🎉 This PR is included in version 4.2.0 🎉

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