Update tests to expect package pruning in full framework targets when multi-targeted to .NET 10

Author: dsplaisted

test/Microsoft.NET.Build.Tests/GivenThatWeWantToBuildAnAppWithoutTransitiveProjectRefs.cs

@@ -79,7 +79,6 @@ public void It_cleans_the_project_successfully_with_static_graph_and_isolation()
                 "1.exe",
                 "1.pdb",
                 "1.exe.config",
-                "System.Diagnostics.DiagnosticSource.dll"
             };
 
             foreach (var targetFramework in targetFrameworks)
@@ -180,6 +179,7 @@ string[] msbuildArguments
             )
         {
             var buildCommand = new BuildCommand(testAsset, "1");
+            buildCommand.WithWorkingDirectory(testAsset.TestRoot);
             var buildResult = buildCommand.ExecuteWithoutRestore(msbuildArguments);
 
             var outputDirectories = targetFrameworks.ToImmutableDictionary(tf => tf, tf => buildCommand.GetOutputDirectory(tf));