fix(percy): wait for fonts before snapshotting

[tay1orjones]

Percy snapshots are still flaky wrt Plex, like this recent build.

This PR updates the visitStory helper for playwright to always wait for fonts to be ready before continuing.

Changelog

Changed

• add page.evaluate call for document.fonts.ready to storybook e2e test utils

Testing / Reviewing

• Percy builds on this PR should not show changes related to plex being unavailable

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.17%. Comparing base (e14e657) to head (7c893d3).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #18334   +/-   ##
=======================================
  Coverage   84.17%   84.17%           
=======================================
  Files         408      408           
  Lines       14435    14435           
  Branches     4690     4640   -50     
=======================================
  Hits        12150    12150           
  Misses       2121     2121           
  Partials      164      164           

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[alisonjoseph]

🙏