Remove CKEditor 4 dependencies/install for full switch to CKEditor 5 in Varbase Layout Builder

Problem/Motivation

✅ Released varbase_editor-9.2.0

• Issue #3442752: Started a new 9.2.x branch for Varbase Editor to support CKEditor 5 and drop support for CKEditor 4
• Issue #3414834 by n.ghunaim: Switched default config for Rich editor and Simple editor from CKEditor 4 to CKEditor 5
• Issue #3442854 by Ahmad Khader: Added CKEditor 5 Paste Filter module to Varbase Editor

Following with:
#3442767: Change Varbase Editor to 9.2.x in Varbase profile to support CKEditor 5 and drop support for CKEditor 4
#3445309: Remove CKEditor 4 dependencies/install for full switch to CKEditor 5 in Varbase Editor

Proposed resolution

Remove CKEditor 4 dependencies or any install

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-9.1.3, varbase_layout_builder-10.0.53

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 #3445308: Removed CKEditor 4 dependencies/install for full switch to CKEditor 5 in Varbase Layout Builder