chore: add a comment to remove hostname after switching to variants

Author: trivikr

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

@@ -136,6 +136,7 @@ private void writePartitionHash() {
                     writer.write("regionRegex: $S,", partition.regionRegex);
                     OptionalUtils.ifPresentOrElse(partition.getPartitionEndpoint(),
                         endpoint -> writer.write("endpoint: $S,", endpoint),
+                        // TODO: Remove population of hostname after switching to variants.
                         () -> writer.write("hostname: $S,", partition.hostnameTemplate));
                     List<Node> variants = partition.getVariants();
                     if (!variants.isEmpty()) {
@@ -174,6 +175,7 @@ private void writeEndpointSpecificResolver(String region, ObjectNode resolved) {
                 || resolved.containsMember("hostname")
                 || resolved.containsMember("credentialScope")) {
             writer.openBlock("$S: {", "},", region, () -> {
+                // TODO: Remove population of hostname after switching to variants.
                 if (resolved.containsMember("hostname")) {
                     String hostname = resolved.expectStringMember("hostname").getValue();
                     writer.write("hostname: $S,", hostname);

packages/config-resolver/src/regionInfo/PartitionHash.ts

@@ -9,6 +9,7 @@ export type PartitionHash = {
   [key: string]: {
     regions: string[];
     regionRegex: string;
+    // TODO: Remove hostname after fully switching to variants.
     hostname?: string;
     endpoint?: string;
     variants?: EndpointVariant[];

packages/config-resolver/src/regionInfo/RegionHash.ts

@@ -6,6 +6,7 @@ import { EndpointVariant } from "./EndpointVariant";
  */
 export type RegionHash = {
   [key: string]: {
+    // TODO: Remove hostname after fully switching to variants.
     hostname?: string;
     variants?: EndpointVariant[];
     signingService?: string;