Fix MissingMethodException from JToken.WriteTo (JamesNK#3104)

Author: JamesNK

Src/Newtonsoft.Json/JsonValidatingReader.cs

@@ -660,7 +660,11 @@ private void WriteToken(IList<JsonSchemaModel> schemas)
                                     if (!schema.Enum.ContainsValue(finishedItem, JToken.EqualityComparer))
                                     {
                                         StringWriter sw = new StringWriter(CultureInfo.InvariantCulture);
+#pragma warning disable IL2026 // Members annotated with 'RequiresUnreferencedCodeAttribute' require dynamic access otherwise can break functionality when trimming application code
+#pragma warning disable IL3050 // Calling members annotated with 'RequiresDynamicCodeAttribute' may break functionality when AOT compiling.
                                         finishedItem.WriteTo(new JsonTextWriter(sw));
+#pragma warning restore IL3050 // Calling members annotated with 'RequiresDynamicCodeAttribute' may break functionality when AOT compiling.
+#pragma warning restore IL2026 // Members annotated with 'RequiresUnreferencedCodeAttribute' require dynamic access otherwise can break functionality when trimming application code
 
                                         RaiseError("Value {0} is not defined in enum.".FormatWith(CultureInfo.InvariantCulture, sw.ToString()), schema);
                                     }

Src/Newtonsoft.Json/Linq/JToken.cs

@@ -438,13 +438,15 @@ public void Replace(JToken value)
             _parent.ReplaceItem(this, value);
         }
 
+        // TODO: Make public in Newtonsoft.Json 14.0+
+        // See https://github.com/JamesNK/Newtonsoft.Json/issues/3084
         /// <summary>
         /// Writes this token to a <see cref="JsonWriter"/>.
         /// </summary>
         /// <param name="writer">A <see cref="JsonWriter"/> into which this method will write.</param>
         [UnconditionalSuppressMessage("Trimming", "IL2026", Justification = "WriteTo without converters is safe.")]
         [UnconditionalSuppressMessage("AOT", "IL3050", Justification = "WriteTo without converters is safe.")]
-        public void WriteTo(JsonWriter writer)
+        private void WriteTo(JsonWriter writer)
         {
             WriteTo(writer, CollectionUtils.ArrayEmpty<JsonConverter>());
         }