Transfer change-notes to CHANGELOG.md via update-release-branch.ts

pr-checks/update-release-branch.ts

@@ -23,6 +23,7 @@ import { parseArgs } from "node:util";
 
 import { type ApiClient, getApiClient } from "./api-client";
 import * as changelog from "./changelog";
+import { transferChangenotesToChangelog } from "./changenotes";
 import { DryRunOption, REPO_ROOT } from "./config";
 import {
   getCurrentVersion,
@@ -693,7 +694,10 @@ export async function prepareNewBranch(
 
     console.log("Updating changelog");
     changelog.withChangelog(
-      (contents) => changelog.setVersionAndDate(version, contents),
+      (contents) => {
+        const populatedContents = transferChangenotesToChangelog(contents);
+        return changelog.setVersionAndDate(version, populatedContents);
+      },
       { ...options, initChangelog: true },
     );