request.download 下载时概率不上报complete事件

**【模块名_概率】简要描述：**
request.download 下载时概率不上报complete事件

**【环境信息】:** 
- 网络环境: 有线网络
- 硬件开发板型号
- 软件版本信息或tag节点: 3.1release
repo init -u https://gitee.com/openharmony/manifest.git -b OpenHarmony-3.1-Release --no-repo-verify
- 测试环境
- 其他

**【预置条件】:**
通过如下方式下载文件时, 当下载任务较多时, 会出现文件已完成下载, 但complete事件未回调

```
var count = 0
export class Downloader {
    private downloadTask

constructor() {
    }

public downloadFile(url: string, file: string, listener: () => void) {
        request.download({
            url: url,
            filePath: file
        }).then(task => {
            this.downloadTask = task

this.downloadTask.on('complete', () => {
                count = count + 1
                console.info(`download ${file} success ${count}`);
                listener()
            })

this.downloadTask.on('fail', (err) => {
                console.error(`download ${file} failed, err: ` + JSON.stringify(err))
            })

}).catch(err => {
            console.error(`download create download task failed, err: ` + JSON.stringify(err))
        })
    }
}
```

**【测试步骤】：**

**【预期结果】：**
多个下载任务结束时, 正常回调complete事件

**【实际结果】：**
多个下载任务结束时, 概率出现回调complete事件不回调

**【恢复手段】：**
无

**【出现概率】：问题出现次数/实际测试次数**

**【定位信息】：**
下载任务结束时, 从日志上看 下载任务完成时, 概率出现设置的回调事件还没设置 
Line 4490: 01-01 03:18:07.526  2272  2311 I 01c00/Downloadkit: [download_service_ability.cpp NotifyHandler 247] DownloadServiceAbility::NotifyHandler started complete-1558 [0, 0].
Line 4517: 01-01 03:18:07.532  2272  2311 I 01c00/Downloadkit: [download_service_ability.cpp NotifyHandler 247] DownloadServiceAbility::NotifyHandler started complete-1561 [0, 0].
Line 4558: 01-01 03:18:07.539  2272  2311 I 01c00/Downloadkit: [download_service_ability.cpp NotifyHandler 247] DownloadServiceAbility::NotifyHandler started complete-1562 [0, 0].
Line 4617: 01-01 03:18:07.547  2272  2309 I 01c00/Downloadkit: [download_service_ability.cpp NotifyHandler 247] DownloadServiceAbility::NotifyHandler started complete-1563 [0, 0].
Line 4618: 01-01 03:18:07.547  2272  2311 I 01c00/Downloadkit: [download_service_ability.cpp NotifyHandler 247] DownloadServiceAbility::NotifyHandler started complete-1565 [0, 0].
Line 4691: 01-01 03:18:07.573  2272  2310 I 01c00/Downloadkit: [download_service_ability.cpp NotifyHandler 247] DownloadServiceAbility::NotifyHandler started complete-1570 [0, 0].
Line 4852: 01-01 03:18:07.589  2272  2310 I 01c00/Downloadkit: [download_service_ability.cpp NotifyHandler 247] DownloadServiceAbility::NotifyHandler started complete-1575 [0, 0].
Line 4984: 01-01 03:18:07.604  2272  2310 I 01c00/Downloadkit: [download_service_ability.cpp NotifyHandler 247] DownloadServiceAbility::NotifyHandler started complete-1576 [0, 0].
Line 5303: 01-01 03:18:07.624  2272  2310 I 01c00/Downloadkit: [download_service_ability.cpp NotifyHandler 247] DownloadServiceAbility::NotifyHandler started complete-1577 [0, 0].
Line 5556: 01-01 03:18:07.636  2272  2310 I 01c00/Downloadkit: [download_service_ability.cpp NotifyHandler 247] DownloadServiceAbility::NotifyHandler started complete-1578 [0, 0].
Line 5845: 01-01 03:18:07.650  2272  2310 I 01c00/Downloadkit: [download_service_ability.cpp NotifyHandler 247] DownloadServiceAbility::NotifyHandler started complete-1579 [0, 0].
Line 6196: 01-01 03:18:07.665  2272  2310 I 01c00/Downloadkit: [download_service_ability.cpp NotifyHandler 247] DownloadServiceAbility::NotifyHandler started complete-1580 [0, 0].
Line 6490: 01-01 03:18:07.680  2272  2272 I 01c00/Downloadkit: [download_service_ability.cpp On 195] DownloadServiceAbility::On started. type=complete-1558
Line 6523: 01-01 03:18:07.681  2272  2310 I 01c00/Downloadkit: [download_service_ability.cpp NotifyHandler 247] DownloadServiceAbility::NotifyHandler started complete-1581 [0, 0].
Line 6614: 01-01 03:18:07.685  2272  2272 I 01c00/Downloadkit: [download_service_ability.cpp On 195] DownloadServiceAbility::On started. type=complete-1559
Line 6715: 01-01 03:18:07.691  2272  2272 I 01c00/Downloadkit: [download_service_ability.cpp On 195] DownloadServiceAbility::On started. type=complete-1560
Line 6719: 01-01 03:18:07.691  2272  2310 I 01c00/Downloadkit: [download_service_ability.cpp NotifyHandler 247] DownloadServiceAbility::NotifyHandler started complete-1582 [0, 0].
Line 6785: 01-01 03:18:07.696  2272  2272 I 01c00/Downloadkit: [download_service_ability.cpp On 195] DownloadServiceAbility::On started. type=complete-1561
Line 6846: 01-01 03:18:07.701  2272  2272 I 01c00/Downloadkit: [download_service_ability.cpp On 195] DownloadServiceAbility::On started. type=complete-1562

- 1. Log、截图、多媒体文件等，所有和问题有关的信息：
log: [丢失时日志](https://gitee.com/haozhoum/misc_res/blob/master/data/hilog/download_completed_lose.log)

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