Incorrect scaling of MDI child forms

### .NET version

.net 8.0, 9.0 Preview6

### Did it work in .NET Framework?

Yes

### Did it work in any of the earlier releases of .NET Core or .NET 5+?

No

### Issue description

The MDI child form for auto-scaling is using the current font of the MDI parent form instead of default application font. When an MDI child form is shown, it uses the font of its parent but doesn't perform auto-scaling. A possible workaround would be to set the form font in the constructor.

### Steps to reproduce

1. Change font size of the MDI parent form
2. Don't set the font of the MDI child form
3. Open MDI child form
4. Notice the incorrect scaling of controls on the child form.

[TestMDIAudoScaling.zip](https://github.com/user-attachments/files/16499712/TestMDIAudoScaling.zip)