Move suppression to delegate

Author: khellang

src/DataProtection/DataProtection/src/XmlEncryption/XmlEncryptionExtensions.cs

@@ -17,6 +17,7 @@ namespace Microsoft.AspNetCore.DataProtection.XmlEncryption;
 internal static unsafe class XmlEncryptionExtensions
 {
     // Used for testing edge case assembly loading errors
+    [UnconditionalSuppressMessage("Trimmer", "IL2057", Justification = "Type.GetType result is only useful with types that are referenced by DataProtection assembly.")]
     internal static Func<string, Type?> _getType = name => Type.GetType(name, throwOnError: false);
 
     public static XElement DecryptElement(this XElement element, IActivator activator)
@@ -70,7 +71,6 @@ public static XElement DecryptElement(this XElement element, IActivator activato
         return doc.Root!;
     }
 
-    [UnconditionalSuppressMessage("Trimmer", "IL2057", Justification = "Type.GetType result is only useful with types that are referenced by DataProtection assembly.")]
     private static IXmlDecryptor CreateDecryptor(IActivator activator, string decryptorTypeName)
     {
         if (!TryGetDecryptorType(decryptorTypeName, out var type))