fix(editor): Enable explicit undo keyboard shortcut across all code editors (#8178)

Fixes [ADO-801](https://linear.app/n8n/issue/ADO-801),
[PAY-632](https://linear.app/n8n/issue/PAY-632), and
[PAY-730](https://linear.app/n8n/issue/PAY-730)
Also fixes #5297

## Review / Merge checklist
- [x] PR title and summary are descriptive

packages/editor-ui/src/components/CodeNodeEditor/CodeNodeEditor.vue

@@ -86,6 +86,7 @@ export default defineComponent({
 		mode: {
 			type: String as PropType<CodeExecutionMode>,
 			validator: (value: CodeExecutionMode): boolean => CODE_EXECUTION_MODES.includes(value),
+			required: true,
 		},
 		language: {
 			type: String as PropType<CodeNodeEditorLanguage>,
@@ -103,6 +104,7 @@ export default defineComponent({
 		},
 		modelValue: {
 			type: String,
+			required: true,
 		},
 	},
 	setup() {