[MONO][WASM] Fix System.ComponentModel.TypeConverter tests by adding …

…missing ILLink dependencies (#50645)

Added missing ILLink descriptors for TypeConverter tests.

eng/testing/ILLink.Descriptor.xunit.xml

@@ -9,7 +9,9 @@
     </type>
     <type fullname="Xunit.Sdk.FactDiscoverer" />
   </assembly>
+  <assembly fullname="Microsoft.DotNet.XUnitExtensions" />
   <assembly fullname="xunit.core">
     <namespace fullname="Xunit" />
   </assembly>
+  <assembly fullname="xunit.runner.utility.netcoreapp10" /> 
 </linker>

src/libraries/System.ComponentModel.TypeConverter/tests/ILLink.Descriptors.xml

@@ -0,0 +1,19 @@
+<!-- This is file is to tell the linker not to remove these assemblies/types/namespace 
+     when aggressive trimming is enabled. -->
+<linker>
+  <assembly fullname="TestUtilities">
+   	<namespace fullname="System" />
+        <type fullname="System.PlatformDetection" />
+  </assembly>
+  <assembly fullname="Castle.Core">
+      <namespace fullname="Castle.DynamicProxy" />
+      <type fullname="Castle.DynamicProxy.Internal.CompositionInvocation" />
+      <type fullname="Castle.DynamicProxy.Internal.AbstractInvocation" />
+      <type fullname="Castle.DynamicProxy.Internal.InheritanceInvocation" />
+  </assembly>
+  <assembly fullname="Moq">
+      <type fullname="Moq.Internals.InterfaceProxy">
+          <method signature="System.Void .ctor()" />
+      </type>
+  </assembly>
+</linker>

src/libraries/System.ComponentModel.TypeConverter/tests/System.ComponentModel.TypeConverter.Tests.csproj

@@ -162,4 +162,7 @@
       <LastGenOutput>TestResx.Designer.cs</LastGenOutput>
     </EmbeddedResource>
   </ItemGroup>
+  <ItemGroup>
+    <TrimmerRootDescriptor Include="$(MSBuildThisFileDirectory)ILLink.Descriptor.xml" />
+  </ItemGroup>
 </Project>