[test] Move remaining experimental.cacheLife (vercel#85467)

Author: eps1lon

test/e2e/app-dir/app-static/next.config.js

@@ -3,13 +3,11 @@ module.exports = {
   logging: {
     fetches: {},
   },
-  experimental: {
-    cacheLife: {
-      expireNow: {
-        stale: 0,
-        expire: 0,
-        revalidate: 0,
-      },
+  cacheLife: {
+    expireNow: {
+      stale: 0,
+      expire: 0,
+      revalidate: 0,
     },
   },
   cacheHandler: process.env.CUSTOM_CACHE_HANDLER