ci: add a script to copy cdk api files to adev (#61081)

Refactors the update-cli-help script into a generic script to copy json
assets, and uses the shared code to also copy the CDK apis

PR Close #61081

adev/scripts/update-cdk-apis/README.md

@@ -0,0 +1,3 @@
+# Generating data for `angular.dev/api` CDK packages
+
+This script updates the Angular CDK api JSON files stored in `adev/src/content/cdk`. This files are used to generate the [angular.dev api](https://angular.dev/api) pages for the CDK packages.

adev/scripts/update-cdk-apis/index.mjs

@@ -0,0 +1,35 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.dev/license
+ */
+
+import {dirname, resolve as resolvePath} from 'node:path';
+import {fileURLToPath} from 'node:url';
+import {copyJsonAssets} from '../shared/copy-json-assets.mjs';
+import {GithubClient} from '../shared/github-client.mjs';
+
+const scriptDir = dirname(fileURLToPath(import.meta.url));
+
+const CDK_BUILDS_REPO = 'angular/cdk-builds';
+const CDK_APIS_CONTENT_PATH = resolvePath(scriptDir, '../../src/content/cdk');
+
+async function main() {
+  await copyJsonAssets({
+    repo: CDK_BUILDS_REPO,
+    assetsPath: '_adev_assets',
+    destPath: CDK_APIS_CONTENT_PATH,
+    githubApi: new GithubClient(
+      CDK_BUILDS_REPO,
+      process.env.ANGULAR_CDK_BUILDS_READONLY_GITHUB_TOKEN,
+      'ADEV_Angular_CDK_Sources_Update',
+    ),
+  });
+}
+
+main().catch((err) => {
+  console.error(err);
+  process.exit(1);
+});