Add tests to make sure that Base.project_names, Base.manifest_names, Base.preferences_names, and Artifacts.artifact_names always have the same length
          #40618
        
          
      
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There is code in Pkg.jl that assumes that the following tuples always have the same length:
Base.project_namesBase.manifest_namesBase.preferences_namesArtifacts.artifact_namesSo we should have tests to make sure that this always stays the case.