Delete global.json

[edumserrano]

Removes the global.json file and configures the build workflow to directly use the .NET 9 SDK.

This simplifies the build configuration and avoids potential issues related to the working directory when using the dotnet CLI.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.60%. Comparing base (624823c) to head (4f83fd4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #228   +/-   ##
=======================================
  Coverage   91.60%   91.60%           
=======================================
  Files          27       27           
  Lines         274      274           
  Branches       25       25           
=======================================
  Hits          251      251           
  Misses         17       17           
  Partials        6        6           

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