refactor(core): Persist node execution order, and forward it to the frontend (#14455)

packages/@n8n/task-runner/src/js-task-runner/__tests__/test-data.ts

@@ -40,6 +40,7 @@ export const newNode = (opts: Partial<INode> = {}): INode => ({
 export const newTaskData = (opts: Partial<ITaskData> & Pick<ITaskData, 'source'>): ITaskData => ({
 	startTime: Date.now(),
 	executionTime: 0,
+	executionIndex: 0,
 	executionStatus: 'success',
 	...opts,
 });