Add test coverage for TrackBar Accessible Object

[Syareel-Sukeri]

Related #10453

Proposed changes

• Add unit test for TrackBar Accessible Object in three files: TrackBarAccessibleObjectTests, TrackBarChildAccessibleObjectTests, TrackBarFirstButtonAccessibleObjectTests
• Test TrackBarAccessibleObjectTests method and property: HitTest, DefaultAction
• Test TrackBarChildAccessibleObjectTests properties: Role, State
• Test TrackBarFirstButtonAccessibleObjectTests property: Name

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

Attention: Patch coverage is 88.23529% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 74.26321%. Comparing base (31176a4) to head (5b01587).
Report is 6 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #11397         +/-   ##
===================================================
- Coverage   74.27181%   74.26321%   -0.00861%     
===================================================
  Files           3025        3025                 
  Lines         626861      626912         +51     
  Branches       46742       46744          +2     
===================================================
- Hits          465581      465565         -16     
- Misses        157935      157992         +57     
- Partials        3345        3355         +10     

Flag	Coverage Δ
Debug	74.26321% <88.23529%> (-0.00861%)	⬇️
integration	17.98995% <ø> (-0.01196%)	⬇️
production	46.98484% <ø> (-0.01265%)	⬇️
test	96.98554% <88.23529%> (-0.00862%)	⬇️
unit	43.96547% <ø> (-0.00246%)	⬇️

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[ricardobossan]

Other than failing check due to seemingly unrelated code, LGTM.

[Syareel-Sukeri]

All checks have passed and asking for a review