WPF tasks return false from ITask.Execute without logging errors

.NET Core SDK (reflecting any global.json):
Version: 3.1.200
Commit: c5123d973b

**Problem description:**
Certain WPF targets can return false without logging errors.

To help customers diagnose "failed" builds without errors, [MSBuild has started logging errors when a task returns "false" from Execute without logging an error](https://github.com/microsoft/msbuild/pull/4940).

This has started catched WPF tasks:

```
Severity Code Description Project File Line Suppression State
Error MSB4132 The "GenerateTemporaryTargetAssembly" task returned false but did not log an error. Microsoft.VisualStudio.Editors C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Microsoft.WinFx.targets 444
Error MSB4132 The "GenerateTemporaryTargetAssembly" task returned false but did not log an error. Microsoft.VisualStudio.ProjectSystem.Managed.VS C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Microsoft.WinFx.targets 444
Warning MSB4132 The "MarkupCompilePass1" task returned false but did not log an error. Microsoft.VisualStudio.LanguageServices.VisualBasic C:\Program Files\dotnet\sdk\3.1.200\Sdks\Microsoft.NET.Sdk.WindowsDesktop\targets\Microsoft.WinFX.targets 225
```
I don't have a repro, but I've hit all above many times over the past few weeks. A pass should be done to verify that that these tasks log an error every occasion that they return false from ITask.Execute.