Add test coverage for TreeView

[Zheng-Li01]

related #10453

Proposed changes

• Add unit tests for TreeView to test its properties: Name, IsReadOnly, ContextMenuStrip, RowBounds, IsVisible, IsExpanded, EnsureVisible
• Add unit tests for TreeView to test its methods: GetChildCount, Add, Insert, CanConvertTo, ConvertTo, HitTest, FromHandle, ExpandAll, Clone, Collapse, GetNodeCount, Toggle

Customer Impact

• None

Regression?

• No

Risk

• Minimal

Test methodology

• Unit tests

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.31701%. Comparing base (4317f31) to head (086a266).
Report is 32 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #11293         +/-   ##
===================================================
- Coverage   74.32617%   74.31701%   -0.00917%     
===================================================
  Files           3018        3025          +7     
  Lines         626381      627684       +1303     
  Branches       46602       46987        +385     
===================================================
+ Hits          465565      466476        +911     
- Misses        157419      157808        +389     
- Partials        3397        3400          +3     

Flag	Coverage Δ
Debug	74.31701% <100.00000%> (-0.00917%)	⬇️
integration	18.26802% <ø> (-0.04285%)	⬇️
production	47.08904% <ø> (+0.11654%)	⬆️
test	97.04319% <100.00000%> (+0.00166%)	⬆️
unit	44.05184% <ø> (+0.13413%)	⬆️

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[lonitra]

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[lonitra]

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