FI-3628: Add check for locked input in checkbox group

[AlyssaWang]

Summary

Fixes a bug where checkboxes in a group input were not locking when the entire group is locked. Locked groups now lock all individual inputs.

Testing Guidance

Test on Demo Group in Demo Suite; there are now separate tests for the following:

• Checkbox Group Input Example (no locking)
• Locked Checkbox Group Input Example (entire group locked)
• Locked Single Checkbox in Group Input Example (one option locked)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.31%. Comparing base (7392983) to head (d5badab).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #590   +/-   ##
=======================================
  Coverage   84.30%   84.31%           
=======================================
  Files         275      275           
  Lines       11688    11691    +3     
  Branches     1307     1307           
=======================================
+ Hits         9854     9857    +3     
  Misses       1824     1824           
  Partials       10       10           

Flag	Coverage Δ
backend	92.63% <100.00%> (+<0.01%)	⬆️
frontend	79.22% <100.00%> (ø)

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