Add code coverage for monthcalendar

[Zheng-Li01]

related #10453

Proposed changes

• Add unit tests for MonthCalendar to test its properties:AccessibleName, RowOrColumnMajor, canGetDefaultActionInternal, GetColumnHeaderItems, IsPatternSupported, CanGetNameInternal, CanGetDescriptionInternal, ShowWeekNumbers
• Add unit tests for MonthCalendar to test its methods: GetItem(), GetRowHeaders(), GetRowHeaderItems(), GetColumnHeaderItems(),

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.62558%. Comparing base (d768c8b) to head (fb21662).
Report is 58 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #11619         +/-   ##
===================================================
+ Coverage   74.46325%   74.62558%   +0.16232%     
===================================================
  Files           3032        3041          +9     
  Lines         628874      630576       +1702     
  Branches       46847       46877         +30     
===================================================
+ Hits          468280      470571       +2291     
+ Misses        157244      156644        -600     
- Partials        3350        3361         +11     

Flag	Coverage Δ
Debug	74.62558% <100.00000%> (+0.16232%)	⬆️
integration	17.98403% <ø> (-0.00403%)	⬇️
production	47.53701% <ø> (+0.21631%)	⬆️
test	96.98311% <100.00000%> (+0.01364%)	⬆️
unit	44.57721% <ø> (+0.27291%)	⬆️

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