Print exit code when trim test fails (#48253)

eng/testing/linker/trimmingTests.targets

@@ -122,7 +122,7 @@
       <Output TaskParameter="ExitCode" PropertyName="ExecutionExitCode" />
     </Exec>
 
-    <Error Condition="'$(ExecutionExitCode)' != '100'" Text="Error: [Failed Test]: %(TestConsoleApps.ProjectCompileItems). The Command %(TestConsoleApps.TestCommand) return a non-success exit code." ContinueOnError="ErrorAndContinue" />
+    <Error Condition="'$(ExecutionExitCode)' != '100'" Text="Error: [Failed Test]: %(TestConsoleApps.ProjectCompileItems). The Command %(TestConsoleApps.TestCommand) returned a non-success exit code: $(ExecutionExitCode)." ContinueOnError="ErrorAndContinue" />
   </Target>
 
   <Target Name="Test" DependsOnTargets="ExecuteApplications" />