fix: fix benchmark powerUserHome tests (#39058)

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## **Description**
Add notification servicemocks to the `powerUserHome` benchmark to
prevent "Unable to enable notifications" errors, which is caused by the
power user fixture's unread notifications triggering authentication with
unmocked external APIs.
eg:
https://github.com/MetaMask/metamask-extension/actions/runs/20750379743/job/59579140493?pr=38614

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## **Related issues**

Fixes:

## **Manual testing steps**

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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Adds notification service mocking to stabilize `powerUser` page-load
benchmarks.
> 
> - Imports `Mockttp` and `mockNotificationServices`, and wires a
`testSpecificMock` in `withFixtures` for `measurePagePowerUser`
> - Ensures notification requests are intercepted during benchmarks by
invoking `mockNotificationServices(server)`
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
04c9b5c. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: DDDDDanica

test/e2e/benchmarks/benchmark.ts

@@ -2,6 +2,7 @@ import { promises as fs } from 'fs';
 import path from 'path';
 import { capitalize } from 'lodash';
 import get from 'lodash/get';
+import { Mockttp } from 'mockttp';
 import { hideBin } from 'yargs/helpers';
 import yargs from 'yargs/yargs';
 import { generateWalletState } from '../../../app/scripts/fixtures/generate-wallet-state';
@@ -16,6 +17,7 @@ import { unlockWallet, withFixtures } from '../helpers';
 import AccountListPage from '../page-objects/pages/account-list-page';
 import HeaderNavbar from '../page-objects/pages/header-navbar';
 import { PAGES } from '../webdriver/driver';
+import { mockNotificationServices } from '../tests/notifications/mocks';
 import {
   BenchmarkArguments,
   BenchmarkResults,
@@ -82,6 +84,9 @@ async function measurePagePowerUser(
       },
       useMockingPassThrough: true,
       disableServerMochaToBackground: true,
+      testSpecificMock: async (server: Mockttp) => {
+        await mockNotificationServices(server);
+      },
     },
     async ({ driver, getNetworkReport, clearNetworkReport }) => {
       await unlockWallet(driver);