Switch test runner to global.json

[Youssef1313]

If dotnet/sdk#50673 gets merged, the insertion of SDK with that change will require the change in this PR.

FYI @LeafShi1 @JeremyKuhne

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.14954%. Comparing base (9634900) to head (ae19f7b).
⚠️ Report is 64 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #13849         +/-   ##
===================================================
+ Coverage   77.10424%   77.14954%   +0.04529%     
===================================================
  Files           3273        3276          +3     
  Lines         644936      645116        +180     
  Branches       47692       47705         +13     
===================================================
+ Hits          497273      497704        +431     
+ Misses        143991      143728        -263     
- Partials        3672        3684         +12     

Flag	Coverage Δ
Debug	77.14954% <ø> (+0.04529%)	⬆️
integration	18.98383% <ø> (-0.01000%)	⬇️
production	52.01048% <ø> (+0.09074%)	⬆️
test	97.40947% <ø> (-0.00310%)	⬇️
unit	49.43416% <ø> (+0.10173%)	⬆️

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