Downgrade Node.js to v20 because of backstopjs

backstop/onBefore.js

@@ -1,35 +1,6 @@
-module.exports = async (page, scenario, vp, isReference, browserContext, config) => {
+module.exports = async (page) => {
+  // Simulate the "prefers-reduced-motion: reduce" media query,
+  // which is a user setting that reduces animations and transitions.
+  // It will provide less distorted test images.
   await page.emulateMedia({ reducedMotion: 'reduce' });
-  // Wait until all assets have been loaded. Image style generation
-  // can sometimes take a long time, causing random failures.
-  await page.waitForLoadState('networkidle');
-
-  const { hostname } = config;
-
-  browserContext.addCookies([
-    {
-      'name': 'cookie-agreed-version',
-      'value': '1.2.4',
-      'domain': hostname,
-      'path': '/',
-      'httpOnly': false,
-      'secure': false
-    },
-    {
-      'name': 'cookie-agreed',
-      'value': '2',
-      'domain': hostname,
-      'path': '/',
-      'httpOnly': false,
-      'secure': false
-    },
-    {
-      'name': 'cookie-agreed-categories',
-      'value': '%5B%22essential%22%2C%22preference%22%2C%22statistics%22%2C%22marketing%22%2C%22chat%22%5D',
-      'domain': hostname,
-      'path': '/',
-      'httpOnly': false,
-      'secure': false
-    }
-  ]);
 };