fix(client-s3): fix union serialization (#1730)

* chore: fix serializing unions in XML

* fix(client-s3): fix union serialization

Author: AllanZhengYP

clients/client-s3/protocols/Aws_restXml.ts

@@ -10152,7 +10152,7 @@ const serializeAws_restXmlAnalyticsFilter = (input: AnalyticsFilter, context: __
       if (!(value instanceof __XmlNode || value instanceof __XmlText)) {
         throw new Error("Unable to serialize unknown union members in XML.");
       }
-      bodyNode.addChildNode(new __XmlNode(value).addChildNode(value));
+      bodyNode.addChildNode(new __XmlNode(name).addChildNode(value));
     },
   });
   return bodyNode;
@@ -11022,7 +11022,7 @@ const serializeAws_restXmlLifecycleRuleFilter = (input: LifecycleRuleFilter, con
       if (!(value instanceof __XmlNode || value instanceof __XmlText)) {
         throw new Error("Unable to serialize unknown union members in XML.");
       }
-      bodyNode.addChildNode(new __XmlNode(value).addChildNode(value));
+      bodyNode.addChildNode(new __XmlNode(name).addChildNode(value));
     },
   });
   return bodyNode;
@@ -11130,7 +11130,7 @@ const serializeAws_restXmlMetricsFilter = (input: MetricsFilter, context: __Serd
       if (!(value instanceof __XmlNode || value instanceof __XmlText)) {
         throw new Error("Unable to serialize unknown union members in XML.");
       }
-      bodyNode.addChildNode(new __XmlNode(value).addChildNode(value));
+      bodyNode.addChildNode(new __XmlNode(name).addChildNode(value));
     },
   });
   return bodyNode;
@@ -11572,7 +11572,7 @@ const serializeAws_restXmlReplicationRuleFilter = (input: ReplicationRuleFilter,
       if (!(value instanceof __XmlNode || value instanceof __XmlText)) {
         throw new Error("Unable to serialize unknown union members in XML.");
       }
-      bodyNode.addChildNode(new __XmlNode(value).addChildNode(value));
+      bodyNode.addChildNode(new __XmlNode(name).addChildNode(value));
     },
   });
   return bodyNode;

codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/XmlShapeSerVisitor.java

@@ -293,7 +293,7 @@ protected void serializeUnion(GenerationContext context, UnionShape shape) {
                 });
 
                 // Set the node explicitly for potentially correct cases.
-                writer.write("bodyNode.addChildNode(new __XmlNode(value).addChildNode(value));");
+                writer.write("bodyNode.addChildNode(new __XmlNode(name).addChildNode(value));");
             });
         });