[UI] Enable strict checking for ArrayUtils tests

[PunugupatiSaikumar]

Enable strict checking for ArrayUtils tests and allow sorting callbacks
to return null or undefined, matching existing documented behavior.

Preserve the invalid-callback runtime test using Reflect.apply().
The sorting implementation remains unchanged.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #3963   +/-   ##
==========================================
  Coverage      55.49%   55.49%           
- Complexity     19598    19600    +2     
==========================================
  Files           3864     3864           
  Lines         178387   178387           
  Branches       14865    14865           
==========================================
  Hits           98976    98976           
- Misses         75523    75525    +2     
+ Partials        3888     3886    -2     

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