Avoid downloading test packages to the global packages folder

src/Microsoft.CodeAnalysis.Testing/Microsoft.CodeAnalysis.Analyzer.Testing/ReferenceAssemblies.cs

@@ -323,7 +323,7 @@ private async Task<ImmutableArray<MetadataReference>> ResolveCoreAsync(string la
                         var downloadResult = await downloadResource.GetDownloadResourceResultAsync(
                             packageToInstall,
                             new PackageDownloadContext(cacheContext),
-                            SettingsUtility.GetGlobalPackagesFolder(settings),
+                            temporaryPackagesFolder,
                             logger,
                             cancellationToken);