ISTWCMS-4210 Add js code which is from...

Merged Eric Bremner requested to merge feature/ISTWCMS-4210-l26yan-Add-mathjax-NEW into 8.x-3.x

ISTWCMS-4210 Add js code which is from https://www.drupal.org/project/layout_builder_modal/issues/3063834#comment-13842736 to source/_patterns/07-ckeditor/js/ckeditor.js

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