feat(Checkbox): add tests to checkbox keyboard navigation and update doc

[EldarMuhamethanov]

• close [Enhancement][a11y] Добавить доступность для Checkbox #2534

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• Unit-тесты
• Документация по доступности

Изменения

• Проверил доступность компонента Checkbox по документации. Поскольку в реализации используется input type="checkbox" все работает как надо
• Обновил доку по компоненту Checkbox. Добавил раздел "Цифровая доступность"
• Добавил тест для проверки навигации табами по checkbox-ам

[github-actions]

size-limit report 📦

Path	Size
JS	368.84 KB (0%)
JS (gzip)	112.95 KB (0%)
JS (brotli)	92.98 KB (0%)
JS import Div (tree shaking)	1.42 KB (0%)
CSS	290.04 KB (0%)
CSS (gzip)	37.72 KB (0%)
CSS (brotli)	30.47 KB (0%)

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[github-actions]

e2e tests

Playwright Report

[github-actions]

👀 Docs deployed

• ✅ Styleguide
• ✅ Storybook

Commit 1c9206e

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.91%. Comparing base (9ba0c02) to head (1c9206e).
Report is 14 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7101      +/-   ##
==========================================
+ Coverage   83.78%   83.91%   +0.12%     
==========================================
  Files         357      357              
  Lines       10676    10785     +109     
  Branches     3551     3557       +6     
==========================================
+ Hits         8945     9050     +105     
- Misses       1731     1735       +4     

Flag	Coverage Δ
unittests	83.91% <ø> (+0.12%)	⬆️

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[inomdzhon]

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