fix(codegen): only trim xml tag values which contain newline

Author: trivikr

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

@@ -135,7 +135,8 @@ static void generateXmlParseBody(GenerationContext context) {
                     writer.openBlock("if (encoded.length) {", "}", () -> {
                         writer.write("const parsedObj = xmlParse(encoded, { attributeNamePrefix: '', "
                                 + "ignoreAttributes: false, parseNodeValue: false, trimValues: false, "
-                                + "tagValueProcessor: (val, tagName) => decodeHTML(val) });");
+                                + "tagValueProcessor: (val) => (val.trim() === '' && val.includes('\\n'))"
+                                + " ? '': decodeHTML(val) });");
                         writer.write("const textNodeName = '#text';");
                         writer.write("const key = Object.keys(parsedObj)[0];");
                         writer.write("const parsedObjToReturn = parsedObj[key];");