UnsupportedTypes, is a test project and should be excluded from the source build. This should prevent pdbs from publishing

Author: Tanya-Solyanik

src/System.Windows.Forms/tests/IntegrationTests/TrimTest/TrimTest.csproj

@@ -46,7 +46,7 @@
     <RuntimeHostConfigurationOption Include="System.Windows.Forms.MdiWindowDialog.IsSupported"
                                     Value="false"
                                     Trim="true" />
-     <RuntimeHostConfigurationOption Include="System.Windows.Forms.ImageIndexConverter.IsSupported"
+    <RuntimeHostConfigurationOption Include="System.Windows.Forms.ImageIndexConverter.IsSupported"
                                     Value="false"
                                     Trim="true" />
     <RuntimeHostConfigurationOption Include="System.Windows.Forms.Primitives.TypeConverterHelper.UseComponentModelRegisteredTypes"

src/System.Windows.Forms/tests/UnsupportedTypes/UnsupportedTypes.csproj

@@ -15,6 +15,7 @@
     <PlatformTarget>AnyCPU</PlatformTarget>
     <EnableXlfLocalization>false</EnableXlfLocalization>
     <UpdateXlfOnBuild>false</UpdateXlfOnBuild>
+    <IsTestUtilityProject>true</IsTestUtilityProject>
   </PropertyGroup>
 
 </Project>