Exclude nuget packages with prefix runtime. from the references

Author: tamasvajk

csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/DependencyManager.cs

@@ -225,6 +225,9 @@ private void RemoveRuntimeNugetPackageReferences()
                 "runtime.linux-x64.microsoft.netcore.app",
                 "runtime.osx-x64.microsoft.netcore.app",
                 "runtime.win-x64.microsoft.netcore.app",
+
+                // Internal implementation packages not meant for direct consumption:
+                "runtime."
             };
             RemoveNugetPackageReference(runtimePackagePrefixes);
         }