feat: Test Utils - Generate exhaustive boolean combinations and MockProxy spread

[bmingles]

New test util features

• Generate exhaustive boolean combinations
• Fixed some type errors in usePickerWithSelectedValues.test.ts (also updated it to use the new boolean test util)
• Added spread support to MockProxy to avoid empty objects when making copies
• Fixed a console error that was happening due to null icons passed to FontAwesomeIcon component in tests

resolves #1809

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (36bc251) 46.06% compared to head (acf544a) 46.11%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1811      +/-   ##
==========================================
+ Coverage   46.06%   46.11%   +0.04%     
==========================================
  Files         627      628       +1     
  Lines       37792    37822      +30     
  Branches     9522     9529       +7     
==========================================
+ Hits        17410    17440      +30     
  Misses      20328    20328              
  Partials       54       54              

Flag	Coverage Δ
unit	46.11% <100.00%> (+0.04%)	⬆️

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