[API PULL] Add E2E tests for Notifications Grant Access

[puntope]

Changes proposed in this Pull Request:

This PR adds an e2e test for banner that grants access to the WPCOM API.

Screenshots:

Detailed test instructions:

1. Run. npm run test:e2e notifications.test.js test pass
2. See E2E test In GH Action passing

Additional details:

Changelog entry

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.5%. Comparing base (0159630) to head (4380d21).
Report is 17 commits behind head on feature/google-api-project.

Additional details and impacted files

@@                       Coverage Diff                       @@
##             feature/google-api-project   #2474      +/-   ##
===============================================================
- Coverage                          64.8%   63.5%    -1.3%     
===============================================================
  Files                               473     322     -151     
  Lines                             17801    5043   -12758     
  Branches                              0    1220    +1220     
===============================================================
- Hits                              11535    3204    -8331     
+ Misses                             6266    1672    -4594     
- Partials                              0     167     +167     

Flag	Coverage Δ
js-unit-tests	63.5% <ø> (?)
php-unit-tests	?

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see 795 files with indirect coverage changes

[martynmjones]

Hey @puntope,

Thanks for expanding our test suite. The changes look good to me ✅