Icu 14778 add more sessions tests (#2615)

* test: 💍 Add desktop sessions tests

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-14778

* chore: 🤖 Add support for dotenv and stop using relative paths

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-14778

* refactor: 💡 Force usage of node 20

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-14778

e2e-tests/package.json

@@ -38,7 +38,7 @@
     "prettier": "^3.0.0"
   },
   "engines": {
-    "node": "18.* || 20.*"
+    "node": "20.* || 22.*"
   },
   "lint-staged": {
     "*.js": "eslint --fix",