[CAL-3582] refactor: packages/app-store/closecom/pages/setup/index.tsx

[PeerRich]

          NIT:

                  const url = new URL("/api/integrations/closecom/add");
                  if (returnTo) url.searchParams.append("returnTo", `${returnTo}`);
                  const res = await fetch(url.href, {

Originally posted by @zomars in https://github.com/calcom/cal.com/pull/14450#discussion_r1578149725

_CAL-3582

[mritosa]

@PeerRich is this issue still open? I would like to contribute to it if its possible.