Fix flaky E2E test in specs/modules/tagmanager/setup.test.js.

[techanvil]

Feature Description

We still have a number of E2E tests failing with some regularity in our CI test runs. The task of fixing them has been split into four issues in order to make it easier to investigate and fix. See #10108, #10109, #10110.

Tag Manager module setup › Setup with AMP active › with Secondary AMP › when validating › validates homepage AMP for non-logged-in users

Example: https://github.com/google/site-kit-wp/actions/runs/12871930956/job/35886293222#step:11:245

Details

FAIL specs/modules/tagmanager/setup.test.js (47.115 s)
  ● Tag Manager module setup › Setup with AMP active › with Secondary AMP › when validating › validates homepage AMP for non-logged-in users

    TimeoutError: Navigation timeout of 5000 ms exceeded

      at ../../node_modules/puppeteer/src/common/LifecycleWatcher.ts:204:18

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Acceptance criteria

• The test listed in the Feature Description should pass every time in CI.

Implementation Brief

Test Coverage

QA Brief

Changelog entry