ACCESSIBILITY user preference

[jacbn]

Adds support for accessibility fields under a new user preference type. Moves the REDUCED_MOTION and PREFER_MATHML prefs under this type, as well as allowing the new SHOW_INACCESSIBLE_WARNING pref.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.28%. Comparing base (bde34c2) to head (97e6687).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #730   +/-   ##
=======================================
  Coverage   37.28%   37.28%           
=======================================
  Files         536      536           
  Lines       23732    23732           
  Branches     2861     2861           
=======================================
  Hits         8849     8849           
  Misses      14001    14001           
  Partials      882      882           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[sjd210]

Looks good, but waiting on react-app change