fix: remove redundant import of timer events in parent orchestration tests

Author: YunchuWang

packages/durabletask-js/test/parent-orchestration-instance.spec.ts

@@ -6,6 +6,8 @@ import { ParentOrchestrationInstance } from "../src/types/parent-orchestration-i
 import {
   newExecutionStartedEvent,
   newOrchestratorStartedEvent,
+  newTimerCreatedEvent,
+  newTimerFiredEvent,
 } from "../src/utils/pb-helper.util";
 import { OrchestrationExecutor } from "../src/worker/orchestration-executor";
 import * as pb from "../src/proto/orchestrator_service_pb";
@@ -135,9 +137,6 @@ describe("Parent Orchestration Instance", () => {
       }),
     ];
 
-    // Import timer events
-    const { newTimerCreatedEvent, newTimerFiredEvent } = require("../src/utils/pb-helper.util");
-
     const oldEventsWithTimer = [
       ...oldEvents,
       newTimerCreatedEvent(1, fireAt),