Delete global.json

[edumserrano]

Updates the .NET SDK version used in the build process to version 9.x.

Removes the note in the dev notes about the importance of running dotnet commands at the /MarkdownLinkCheckLogParser folder since global.json is no longer being used.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.02%. Comparing base (f24339b) to head (3f9d31d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #212   +/-   ##
=======================================
  Coverage   91.02%   91.02%           
=======================================
  Files          44       44           
  Lines         479      479           
  Branches       51       51           
=======================================
  Hits          436      436           
  Misses         35       35           
  Partials        8        8           

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