add a user hook; stubbed out for OSS-side; clerked out for cloud-side (#2924)

skyvern-frontend/src/hooks/useUser.ts

@@ -0,0 +1,9 @@
+import { UserContext } from "@/store/UserContext";
+import { useContext } from "react";
+
+function useUser() {
+  const getUser = useContext(UserContext);
+  return { get: getUser };
+}
+
+export { useUser };