Fix the CKEditor 5 Source code editing area on the Varbase Layout Builder 10.0.x branch for Varbase 9.1.x

Problem/Motivation

The fix for #3416440: Fix CKEditor 5 Source code editing area was merged into 10.1.x-dev but wasn't backported to 10.0.x-dev.

Please refer to the above issue for more information.

Proposed resolution

Backport the fix to 10.0.x-dev.

Remaining tasks

• ✅ File an issue about this project
• ✅ Addition/Change/Update/Fix to this project
• ✅ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ➖ Developer Documentation support on feature change/addition
• ➖ User Guide Documentation support on feature change/addition
• ➖ UX/UI designer responsibilities
• ➖ Accessibility and Readability
• ✅ Code review from 1 Varbase core team member
• ✅ Full testing and approval
• ✅ Credit contributors
• ✅ Review with the product owner
• ✅ Update Release Notes and Update Helper on new feature change/addition
• ✅ Release varbase-9.1.4, varbase_layout_builder-10.0.55

Varbase update type

• ✅ No Update
• ➖ Optional Update
• ➖ Forced Update
• ➖ Forced Update if Unchanged

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• Issue #3447577 by Redwan Jamous: Fixed the CKEditor 5 Source code editing area on the Varbase Layout Builder 10.0.x branch for Varbase 9.1.x