Added a confirmation mechanism to notify users when the Fleet agent successfully installed on Windows.

[parsimeikoikai]

Fix fo #21980

Checklist for submitter

• For Orbit and Fleet Desktop changes:
  • Orbit runs on macOS, Linux and Windows. Check if the orbit feature/bugfix should only apply to one platform (runtime.GOOS).
  • Manual QA must be performed in the three main OSs, macOS, Windows and Linux.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.58%. Comparing base (e78bf6e) to head (aec043a).
Report is 69 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #24987      +/-   ##
==========================================
+ Coverage   63.56%   63.58%   +0.01%     
==========================================
  Files        1602     1607       +5     
  Lines      151820   152255     +435     
  Branches     3952     3952              
==========================================
+ Hits        96511    96814     +303     
- Misses      47624    47727     +103     
- Partials     7685     7714      +29     

Flag	Coverage Δ
backend	64.38% <ø> (+0.01%)	⬆️

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