Icu 11936 support node 20 stop support node 16 (#2282)

* chore: 🤖 remove .mdx format script in rose addon

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-11936

* chore: 🤖 deprecate use of node v16 and include node v20

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-11936

* chore: 🤖 update github workflows to use node v18

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-11936

* chore: 🤖 update workflows to use node v20

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-11936

addons/api/package.json

@@ -76,7 +76,7 @@
     "ember-source": ">4.0.0"
   },
   "engines": {
-    "node": "16.* || 18.*"
+    "node": "18.* || 20.*"
   },
   "ember": {
     "edition": "octane"