Fix CA1052 in TypeCatalogGen (#15840)

src/TypeCatalogGen/TypeCatalogGen.cs

@@ -27,7 +27,7 @@ using System.Text;
 
 namespace Microsoft.PowerShell.CoreCLR
 {
-    public class TypeCatalogGen
+    public static class TypeCatalogGen
     {
         // Help messages
         private const string Param_TargetCSharpFilePath = "TargetCSharpFilePath";

src/TypeCatalogGen/TypeCatalogGen.csproj

@@ -3,6 +3,7 @@
   <PropertyGroup>
     <Description>Generates CorePsTypeCatalog.cs given powershell.inc</Description>
     <TargetFramework>net6.0</TargetFramework>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <AssemblyName>TypeCatalogGen</AssemblyName>
     <OutputType>Exe</OutputType>
     <TieredCompilation>true</TieredCompilation>