Retry on some FCM v1 errors occur.

[fujiwara]

Gunfish doesn't retry when some FCM v1 errors occur.

When FCM returns INTERNAL or UNAVAILABLE error, it should be retried.
https://firebase.google.com/docs/cloud-messaging/http-server-ref?hl=ja#error-codes

{
    "file": "/home/runner/work/Gunfish/Gunfish/supervisor.go",
    "level": "error",
    "line": "432",
    "msg": "Unknown error message: INTERNAL",
    "res_queue_size": 0,
    "resend_cnt": 0,
    "resp_uid": "6d9db339-bcdf-4db5-9b64-14b671e978ec",
    "response_time": 5.047958725,
    "time": "2024-03-26T13:07:19Z",
    "token": "xxx",
    "type": "worker",
    "worker_id": 61
}