Lexical: Fixed code in lists, removed extra old alignment code

Code in lists could throw error on parse due to inner <code> tag being
parsed but not actually used within a <pre>, so this updates the
importDOM to disregard childdren for code blocks.

This also improves the invariant implementation to not be so
dev/debugger based, and to include vars in the output.

resources/js/wysiwyg/lexical/rich-text/LexicalCodeBlockNode.ts

@@ -145,7 +145,14 @@ export class CodeBlockNode extends DecoratorNode<EditorDecoratorAdapter> {
                             node.setId(element.id);
                         }
 
-                        return { node };
+                        return {
+                            node,
+                            after(childNodes): LexicalNode[] {
+                                // Remove any child nodes that may get parsed since we're manually
+                                // controlling the code contents.
+                                return [];
+                            },
+                        };
                     },
                     priority: 3,
                 };