[Fix] Various fixes

[abaicus]

Summary

1. Fixes issue with Elementor Pro Header & Footer builder breaking theme markup - Custom Header in Elementor Pro affects the shop page layout #4349
2. Fixes deprecation notice on nullable parameter - Deprecated notice in PHP 8.4 #4393;
3. Fixes issue with custom layouts notice going off-screen - Custom Layouts notice goes down the screen, when other plugins have menu items in the WP menu #4391;

Will affect visual aspect of the product

NO

Test instructions

1. #4349

• Install Elementor, Elementor Pro & Woocommerce;
• Make sure you have a basic shop set up;
• Go to Templates > Theme Builder;
• Create a Header (maybe test with footer as well) - you can set it to display sitewide, or any other way to accomodate testing;
• Layout on Shop should work as expected;
• Layout on Blog Archive when using a sidebar;

2. #4393

• Use an instance with PHP v8.4 and WP_DEBUG enabled;
• No notice should be displayed;
• Customizer should work fine - especially the Header/Footer builder components settings (you can check 1-2 components);

3. #4349

• Install this plugin and activate it: loads-of-menu-pages.zip
• Go into the Dashboard > Loads of Menu Pages page - here you can set up to 100 dummy dashboard pages;
• Set an arbitrary number (enough to be able to scroll the dashboard);
• Go to the custom layouts page (the one with the upsell);
• The modal should stay into view when scrolling

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 #4349.
Closes #4393;
Closes #4391;

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