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/ExpressionEditorModal/ExpressionEditorModalInput.vue

@@ -6,7 +6,7 @@
 import { defineComponent } from 'vue';
 import { EditorView, keymap } from '@codemirror/view';
 import { EditorState, Prec } from '@codemirror/state';
-import { history, redo } from '@codemirror/commands';
+import { history, redo, undo } from '@codemirror/commands';
 
 import { workflowHelpers } from '@/mixins/workflowHelpers';
 import { expressionManager } from '@/mixins/expressionManager';
@@ -26,12 +26,15 @@ export default defineComponent({
 	props: {
 		modelValue: {
 			type: String,
+			required: true,
 		},
 		path: {
 			type: String,
+			required: true,
 		},
 		isReadOnly: {
 			type: Boolean,
+			default: false,
 		},
 	},
 	data() {
@@ -56,6 +59,7 @@ export default defineComponent({
 							return false;
 						},
 					},
+					{ key: 'Mod-z', run: undo },
 					{ key: 'Mod-Shift-z', run: redo },
 				]),
 			),