fix #12777 Keyboard tooltip of toolStripDropDownButton item still displaying when tab to other control

[Epica3055]

fix #12777

Proposed changes

• add hiding ToolTip logic, When toolstrip loses focus,

Customer Impact

• now tooltip can disappear.

Screenshots

Before

10.0.mp4

After

issues_12777_01.mp4

Test methodology

• manual

Test environment(s)

10.0.0-alpha.1.25064.15

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.19553%. Comparing base (776484e) to head (8c644e4).
Report is 3 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #12797         +/-   ##
===================================================
+ Coverage   76.18249%   76.19553%   +0.01304%     
===================================================
  Files           3194        3195          +1     
  Lines         640365      640405         +40     
  Branches       47239       47239                 
===================================================
+ Hits          487846      487960        +114     
+ Misses        148983      148923         -60     
+ Partials        3536        3522         -14     

Flag	Coverage Δ
Debug	76.19553% <100.00000%> (+0.01304%)	⬆️
integration	18.15155% <100.00000%> (-0.01169%)	⬇️
production	50.13919% <100.00000%> (+0.02161%)	⬆️
test	97.02394% <ø> (+0.00397%)	⬆️
unit	47.53953% <100.00000%> (-0.00017%)	⬇️

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[Tanya-Solyanik]

@Epica3055 - please send this to the test team for verification.