test: Fix test file content load for mocked fs-extra (#31687)

test/http-mock.ts

@@ -1,7 +1,6 @@
 import type { Url } from 'node:url';
 import { afterAll, afterEach, beforeAll } from '@jest/globals';
 import { codeBlock } from 'common-tags';
-import fs from 'fs-extra';
 // eslint-disable-next-line no-restricted-imports
 import nock from 'nock';
 import { makeGraphqlSnapshot } from './graphql-snapshot';
@@ -124,6 +123,7 @@ function massageHttpMockStacktrace(err: Error): void {
  return;
  }
 
+ const fs: typeof import('fs-extra') = jest.requireActual('fs-extra');
  const content = fs.readFileSync(state.testPath, { encoding: 'utf8' });
 
  // Shrink the `testName` until we could locate it in the source file