chore: add missing E2E tests for frozen grid tabbing

[ghiscoding]

forgot to add Cypress E2E tests for previous PR #2421 also note that Shift+Tab isn't supported in Cypress, so I can't test that feature

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (e3c23c7) to head (828b0fb).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2422   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files         196      196           
  Lines       24314    24314           
  Branches     8518     8518           
=======================================
  Hits        24314    24314           

Flag	Coverage Δ
angular	100.0% <ø> (ø)
universal	100.0% <ø> (ø)

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commit: 8b170c3