Add RuntimeHostConfigurationOption for COM descriptor support (#40106)

Adds SDK logic for the feature switch
System.ComponentModel.TypeDescriptor.IsComObjectDescriptorSupported.

Tests that the switch is disabled by default in trimmed apps.

Author: sbomer

src/Assets/TestProjects/KitchenSink/TestApp/TestApp.csproj

@@ -12,6 +12,7 @@
     <VerifyDependencyInjectionOpenGenericServiceTrimmability>true</VerifyDependencyInjectionOpenGenericServiceTrimmability>
     <_AggressiveAttributeTrimming>true</_AggressiveAttributeTrimming>
     <EnableUnsafeBinaryFormatterInDesigntimeLicenseContextSerialization>false</EnableUnsafeBinaryFormatterInDesigntimeLicenseContextSerialization>
+    <_ComObjectDescriptorSupport>false</_ComObjectDescriptorSupport>
     <DebuggerSupport>true</DebuggerSupport>
     <EventSourceSupport>false</EventSourceSupport>
     <MetricsSupport>false</MetricsSupport>

src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets

@@ -499,6 +499,11 @@ Copyright (c) .NET Foundation. All rights reserved.
                                     Value="$(EnableUnsafeBinaryFormatterInDesigntimeLicenseContextSerialization)"
                                     Trim="true" />
 
+    <RuntimeHostConfigurationOption Include="System.ComponentModel.TypeDescriptor.IsComObjectDescriptorSupported"
+                                    Condition="'$(_ComObjectDescriptorSupport)' != ''"
+                                    Value="$(_ComObjectDescriptorSupport)"
+                                    Trim="true" />
+
     <RuntimeHostConfigurationOption Include="System.Diagnostics.Debugger.IsSupported"
                                     Condition="'$(DebuggerSupport)' != ''"
                                     Value="$(DebuggerSupport)"

test/Microsoft.NET.Publish.Tests/GivenThatWeWantToPublishAProjectWithAllFeatures.cs

@@ -59,6 +59,7 @@ public void It_publishes_the_project_correctly(string targetFramework, string[]
             ""Microsoft.Extensions.DependencyInjection.VerifyOpenGenericServiceTrimmability"": true,
             ""System.AggressiveAttributeTrimming"": true,
             ""System.ComponentModel.TypeConverter.EnableUnsafeBinaryFormatterInDesigntimeLicenseContextSerialization"": false,
+            ""System.ComponentModel.TypeDescriptor.IsComObjectDescriptorSupported"": false,
             ""System.Diagnostics.Debugger.IsSupported"": true,
             ""System.Diagnostics.Metrics.Meter.IsSupported"": false,
             ""System.Diagnostics.Tracing.EventSource.IsSupported"": false,

test/Microsoft.NET.Publish.Tests/GivenThatWeWantToRunILLink.cs

@@ -1044,6 +1044,12 @@ public void TrimmingOptions_are_defaulted_correctly_on_trimmed_apps(string targe
                     configProperties["System.Text.Json.JsonSerializer.IsReflectionEnabledByDefault"].Value<bool>()
                         .Should().BeFalse();
                 }
+
+                if (parsedVersion.Major >= 9)
+                {
+                    configProperties["System.ComponentModel.TypeDescriptor.IsComObjectDescriptorSupported"].Value<bool>()
+                        .Should().BeFalse();
+                }
             }
             else
             {