latest version should open by default (#3999)

Modified releasenotes.ts files so that latest version should open by
default and updated the testcases #3980

---------

Co-authored-by: Eric Arellano <[email protected]>

Author: GantaRoja

docs/api/qiskit/release-notes/index.mdx

@@ -9,7 +9,7 @@ New features, bug fixes, and other changes in previous versions of Qiskit SDK.
 
 ## Release notes by version
 
-<details>
+<details open>
 <summary>v2</summary>
 - [v2.2](./2.2)
 - [v2.1](./2.1)

scripts/js/lib/api/releaseNotes.test.ts

@@ -41,7 +41,7 @@ test.describe("generateReleaseNotesIndex", () => {
     const result = generateReleaseNotesIndex(pkg);
     expect(result).toContain(`# My Quantum Project release notes`);
     expect(result).toContain(`
-<details>
+<details open>
 <summary>v2</summary>
 - [v2.0](./2.0)
 </details>

scripts/js/lib/api/releaseNotes.ts

@@ -170,9 +170,12 @@ New features, bug fixes, and other changes in previous versions of ${pkg.title}.
   const grouped = groupByMajorVersion(
     pkg.releaseNotesConfig.separatePagesVersions,
   );
-  for (const [majorVersion, versionList] of grouped) {
-    markdown += renderVersionGroup(majorVersion, versionList) + "\n\n";
-  }
+  [...grouped.entries()].forEach(([majorVersion, versionList], idx) => {
+    markdown +=
+      renderVersionGroup(majorVersion, versionList, {
+        isLatestVersion: idx === 0,
+      }) + "\n\n";
+  });
   return markdown.trim();
 }
 
@@ -272,12 +275,17 @@ export function groupByMajorVersion(versions: string[]): Map<string, string[]> {
   return sortedRecord;
 }
 
-function renderVersionGroup(majorVersion: string, versions: string[]): string {
+function renderVersionGroup(
+  majorVersion: string,
+  versions: string[],
+  kwargs: { isLatestVersion?: boolean } = {},
+): string {
   const items = versions
     .map((version) => `- [v${version}](./${version})`)
     .join("\n");
+  const openAttr = kwargs.isLatestVersion ? " open" : "";
   return `
-<details>
+<details${openAttr}>
 <summary>v${majorVersion}</summary>
 ${items}
 </details>