IsQuotaExceeded does not return true even if the FCM Rate limit is exceeded.

[laststem]

We got 429 HTTP status from FCM server.

HTTP response body:

{
  "error": {
    "code": 429,
    "message": "Quota exceeded for quota metric 'Send requests' and limit 'Send requests per minute' of service 'fcm.googleapis.com' for consumer 'project_number:xxx'.",
    "status": "RESOURCE_EXHAUSTED",
    "details": [
      {
        "@type": "type.googleapis.com/google.rpc.ErrorInfo",
        "reason": "RATE_LIMIT_EXCEEDED",
        "domain": "googleapis.com",
        "metadata": {
          "quota_limit_value": "xxx",
          "consumer": "projects/xxx",
          "quota_metric": "fcm.googleapis.com/send_requests",
          "quota_unit": "1/min/{project}",
          "service": "fcm.googleapis.com",
          "quota_location": "global",
          "quota_limit": "SendsPerMinutePerProject"
        }
      },
      {
        "@type": "type.googleapis.com/google.rpc.Help",
        "links": [
          {
            "description": "Request a higher quota limit.",
            "url": "https://cloud.google.com/docs/quotas/help/request_increase"
          }
        ]
      }
    ]
  }
}

When the FCM Rate limit was exceeded, the above HTTP Response was returned, but when passed to IsQuotaExceeded, false was returned.

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