fix(toggle): remove presentational checkmark svg from accessibility tree

[tay1orjones]

Closes #17676

Reference

Changelog

Changed

• add aria-hidden and focusable:false to checkmark svg

Testing / Reviewing

1. Open Toggle component description on storybook
2. Go to playground and choose the "sm" value of "size" prop
3. Open the result in fullscreen/iframe
4. Scan it with IBM Equal Access Accessibility Checker
5. There should be no violation regarding the svg having no accessible name

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.00%. Comparing base (261d33c) to head (51d4e62).
Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #17719   +/-   ##
=======================================
  Coverage   79.00%   79.00%           
=======================================
  Files         408      408           
  Lines       14008    14008           
  Branches     4319     4367   +48     
=======================================
  Hits        11067    11067           
  Misses       2775     2775           
  Partials      166      166           

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