Start a new 9.2.x branch for Varbase Editor to support CKEditor 5 and drop support for CKEditor 4

Problem/Motivation

#3414834: Switch default config for Rich editor and Simple editor from CKEditor 4 to CKEditor 5
#3442854: Add CKEditor 5 Paste Filter module to Varbase Editor

Proposed resolution

• Start a new 9.2.x branch for Varbase Editor
• Switch to CKEditor 5 and drop support for CKEditor 4
• Enable the CKEditor 5 module - drupal:ckeditor5
• Remove "drupal/ckeditor": "~1", from the composer.json file.
• Change to "vardot/varbase-patches": "~9.2.0",
• Change to "drupal/anchor_link": "~3",
• Change to "drupal/ckeditor_media_embed": "~2",

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_editor-9.2.0

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 #3442752: Started a new 9.2.x branch for Varbase Editor to support CKEditor 5 and drop support for CKEditor 4