[Bug]: wpftmp directory remains on disk and not cleaned up

### Issue Description

I noticed that with MSBuild 17.7.2 the wpftmp directory remains on disk after building WPF projects, and isn't cleaned up.

These don't go away:


Feels like a regression from 17.6?? I think?

### Steps to Reproduce

Repro:
```
git clone https://github.com/KirillOsenkov/MSBuildStructuredLog
msbuild /r /m /bl MSBuildStructuredLog.sln
```

### Expected Behavior

wpftmp directories should get deleted after build

### Actual Behavior

not deleted

### Analysis

_No response_

### Versions & Configurations

_No response_