This diff introduces changes to the send_notif_to_apns function to handle the HTTP error code inside the function instead of passing it to the upper level. Passing to the upper level and handling it in another place and then inside the function doesn't make sense. The better approach here is to handle the errors inside the Rust function and return an Error in case something goes wrong.

Related linear task: ENG-1740

1. Successfully built using Docker.
2. Successfully call the function from C++:

#include "cxxbridge_code/src/lib.rs.h"
#include "rust/cxx.h
...
const std::string cert_path = argv[1];
const std::string cert_pass = argv[2];
const std::string device_token = argv[3];
const std::string message_body = argv[4];
sendNotifToAPNS(cert_path, cert_pass, device_token, message_body, true);