Omitted requireOneSlicingArgument if not set in listSize directive

[glen-84]

Summary of the changes (Less than 80 chars)

• Omitted requireOneSlicingArgument if not set in listSize directive.

Closes #7398

---

• @michaelstaib to add another test.

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.87%. Comparing base (3fd69ab) to head (26e889b).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...alysis/src/CostAnalysis/Types/ListSizeAttribute.cs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7418      +/-   ##
==========================================
+ Coverage   77.82%   77.87%   +0.04%     
==========================================
  Files        2827     2827              
  Lines      141949   141953       +4     
==========================================
+ Hits       110478   110546      +68     
+ Misses      31471    31407      -64     

Flag	Coverage Δ
unittests	77.87% <88.88%> (+0.04%)	⬆️

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