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Describe the bug
A 500 error appears in the browser console, the website is still functional but cache and optimizations are not applied.

This is related to Automatic Lazy Rendering and its usage of PHP dom extension
When the dom extension (https://www.php.net/en/dom) is disabled in the server, it triggers the error here:

Error log:
5818 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught Error: Class "DOMDocument" not found in /wp-content/plugins/wp-rocket/inc/Engine/Optimization/LazyRenderContent/Frontend/Processor/Dom.php:81
To solve they need to enable the dom extension in PHP

To Reproduce
Steps to reproduce the behavior:

1. Disable DOM extension in PHP
2. Visit the frontend of the site
3. See the 500 error console error

Expected behavior
We should check if DOM extension is enabled or not, and:

• show a warning to the users in the backend
• Avoid the fatal error

Additional context
Ticket 1: https://secure.helpscout.net/conversation/2720908346/514956?folderId=2683093
Ticket 2: https://secure.helpscout.net/conversation/2723174345/515454?folderId=2683093
Slack thread: https://wp-media.slack.com/archives/C43T1AYMQ/p1727853713650349

Acceptance Criteria (for WP Media team use only)
Clear instructions for developers, to be added before the grooming