Move cookie fetch to separate file.

src/components/AuthUser/SignInForm/fetchCookie.ts

+import axios from 'axios';
+
+export const fetchCookie = async (
+  setIsCookieFetched: React.Dispatch<React.SetStateAction<string>>,
+): Promise<unknown> => {
+  const response = await axios('/api/web/csrf');
+  setIsCookieFetched(response.data.token);
+  return null;
+};