feat(core): Update to ckeditor 5. Fixes #5920. Encapsulate signature in raw-html-embed div when there are tables inside. Changed settings for raw html to enable preview.

UI/WebServerResources/js/Common/sgCkeditor.component.js

@@ -254,6 +254,9 @@
           }
         ]
       };
+      config.htmlEmbed = {
+        showPreviews: true
+      };
       config.image = {
         resizeUnit: "px",
         insert: {