Move back cookie fetch to SignInForm. Role fetched and saved into a Context. Small refactorings.

src/api/PrivateRoute/PrivateRoute.tsx

@@ -57,7 +57,7 @@ export const PrivateRoute = ({
           <Redirect
             to={{
               pathname: userHasRequiredRole
-                ? `auth/${NonAuthRoutes.signIn}`
+                ? `${NonAuthRoutes.auth}${NonAuthRoutes.signIn}`
                 : NonAuthRoutes.unauthorized,
               state: {
                 message,