test: reduce flakiness of reuse-dep-optimization-cache e2e test

This commit reduces test flakiness by modifying the logic to perform the fetch only after the app is bundled.

(cherry picked from commit 87b310a)

Author: alan-agius4

tests/legacy-cli/e2e/tests/vite/reuse-dep-optimization-cache.ts

@@ -1,23 +1,28 @@
 import assert from 'node:assert';
-import { setTimeout } from 'node:timers/promises';
 import { findFreePort } from '../../utils/network';
-import { execAndWaitForOutputToMatch, killAllProcesses, ng } from '../../utils/process';
+import {
+  execAndWaitForOutputToMatch,
+  killAllProcesses,
+  ng,
+  waitForAnyProcessOutputToMatch,
+} from '../../utils/process';
 
 export default async function () {
   await ng('cache', 'clean');
   await ng('cache', 'on');
 
   const port = await findFreePort();
+  await execAndWaitForOutputToMatch(
+    'ng',
+    ['serve', '--port', `${port}`],
+    /Application bundle generation complete/,
+    // Use CI:0 to force caching
+    { DEBUG: 'vite:deps', CI: '0', NO_COLOR: 'true' },
+  );
 
   const [, response] = await Promise.all([
-    execAndWaitForOutputToMatch(
-      'ng',
-      ['serve', '--port', `${port}`],
-      /dependencies optimized/,
-      // Use CI:0 to force caching
-      { DEBUG: 'vite:deps', CI: '0', NO_COLOR: 'true' },
-    ),
-    setTimeout(4_000).then(() => fetch(`http://localhost:${port}/main.js`)),
+    waitForAnyProcessOutputToMatch(/dependencies optimized/, 10_000),
+    fetch(`http://localhost:${port}/main.js`),
   ]);
 
   assert(response.ok, `Expected 'response.ok' to be 'true'.`);