✅(e2e) remove some flakiness

Service worker added some flakiness, we
activate the sw only if not from the CI.
We add as well the email of the user added in a
doc to the toast message. This way we can check
if the user was added correctly, this will remove
some flakiness in some tests.

src/frontend/package.json

@@ -26,6 +26,7 @@
   "resolutions": {
     "@types/node": "20.14.2",
     "@types/react-dom": "18.3.0",
+    "cross-env": "7.0.3",
     "react": "18.2.0",
     "react-dom": "18.2.0",
     "typescript": "5.4.5",