feat: support next.js 15.4.4 (#13280)

- bumps next.js from 15.3.2 to 15.4.4 in monorepo and templates. It's
important to run our tests against the latest Next.js version to
guarantee full compatibility.
- bumps playwright because of peer dependency conflict with next 15.4.4
- bumps react types because why not

https://nextjs.org/blog/next-15-4

As part of this upgrade, the functionality added by
https://github.com/payloadcms/payload/pull/11658 broke. This PR fixes it
by creating a wrapper around `React.isValidElemen`t that works for
Next.js 15.4.

---
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used, see below:
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packages/live-preview-react/package.json

@@ -46,8 +46,8 @@
   },
   "devDependencies": {
     "@payloadcms/eslint-config": "workspace:*",
-    "@types/react": "19.1.0",
-    "@types/react-dom": "19.1.2",
+    "@types/react": "19.1.8",
+    "@types/react-dom": "19.1.6",
     "payload": "workspace:*"
   },
   "peerDependencies": {