chore: remove httpHeaders from metadata

Author: trivikr

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/integration/HttpProtocolGeneratorUtils.java

@@ -188,7 +188,6 @@ static void generateMetadataDeserializer(GenerationContext context, SymbolRefere
         writer.openBlock("const deserializeMetadata = (output: $T): __ResponseMetadata => ({", "});", responseType,
                 () -> {
                     writer.write("httpStatusCode: output.statusCode,");
-                    writer.write("httpHeaders: output.headers,");
                     writer.write("requestId: output.headers[\"x-amzn-requestid\"]");
                 });
         writer.write("");