Use experiemental in all uEE doc sandboxes (#7820)

Author: rickhanlonii

src/content/learn/separating-events-from-effects.md

@@ -973,6 +973,23 @@ To fix this code, it's enough to follow the rules.
 
 <Sandpack>
 
+```json package.json hidden
+{
+  "dependencies": {
+    "react": "experimental",
+    "react-dom": "experimental",
+    "react-scripts": "latest"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test --env=jsdom",
+    "eject": "react-scripts eject"
+  }
+}
+```
+
+
 ```js
 import { useState, useEffect } from 'react';
 
@@ -1026,6 +1043,22 @@ If you remove the suppression comment, React will tell you that this Effect's co
 
 <Sandpack>
 
+```json package.json hidden
+{
+  "dependencies": {
+    "react": "experimental",
+    "react-dom": "experimental",
+    "react-scripts": "latest"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test --env=jsdom",
+    "eject": "react-scripts eject"
+  }
+}
+```
+
 ```js
 import { useState, useEffect } from 'react';