Add Datadog RUM (#28)

src/components/App/App.test.js

@@ -1,6 +1,7 @@
 jest.mock("../Contexts/UserContext");
 jest.mock("../Contexts/FileUploadContext");
 jest.mock("../Contexts/VehicleContext");
+jest.mock("../../services/monitoring");
 
 import { render, screen, cleanup, waitForElementToBeRemoved } from "@testing-library/react";
 import { setToken } from "../Contexts/UserContext";