feature(PROT-4812): adds backgroundColor prop to RadioCheckToggleCard

[michael-alterio]

• Adds optional backgroundColor prop to RadioCheckToggleCard component
• Updates title prop to string | React.ReactElement
• Adds new stories and unit tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.86%. Comparing base (46130fe) to head (65cef3f).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1546      +/-   ##
==========================================
+ Coverage   93.84%   93.86%   +0.02%     
==========================================
  Files         154      154              
  Lines       11463    11454       -9     
  Branches      703      703              
==========================================
- Hits        10757    10751       -6     
+ Misses        682      679       -3     
  Partials       24       24              

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