Flaky test investigation

[powerivq]

Description

Circle end-to-end test reliably fails for this test. Investigate and fix:

1. amp-subscriptions-google
   chrome
   Standalone environment

       Subscription offers should render correctly:
   

   Error: Timeout of 3000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/home/circleci/project/extensions/amp-subscriptions-google/0.1/test-e2e/test-amp-subscriptions-google.js)
   at createTimeoutError (/home/circleci/project/node_modules/mocha/lib/errors.js:498:15)
   at Runnable._timeoutError (/home/circleci/project/node_modules/mocha/lib/runnable.js:431:10)
   at Timeout. (/home/circleci/project/node_modules/mocha/lib/runnable.js:246:24)
   at listOnTimeout (node:internal/timers:573:17)
   at process.processTimers (node:internal/timers:514:7)

Reproduction Steps

Run test on CI

Relevant Logs

No response

Browser(s) Affected

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OS(s) Affected

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Device(s) Affected

No response

AMP Version Affected

No response