fix: defect in extension process during rename duplicate file (#1158)

[Little-King2022]

Fix: #1158
下载没有扩展名的文件时也可以进行自动重命名

Web端测试：

本地下载目录：

[monkeyWie]

非常感谢，CI没问题的话就merge了

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.17%. Comparing base (07dc196) to head (05e8287).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1173      +/-   ##
==========================================
+ Coverage   65.89%   68.17%   +2.28%     
==========================================
  Files          42       42              
  Lines        5075     4207     -868     
==========================================
- Hits         3344     2868     -476     
+ Misses       1412     1020     -392     
  Partials      319      319              

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[Little-King2022]

@monkeyWie
非常抱歉，刚才提交的代码只能处理前5个文件的重命名（因为最大下载数默认为5），后续的文件仍然无法重命名。

似乎不仅仅是这段代码的问题，第二批下载的文件并没有调用重名检查逻辑

以下是大于5个文件的下载情况，只有第一批的文件重命名成功了：

以下是本地下载路径：

非常抱歉我这边没有测试完第二批就忙着提交了🥲

[monkeyWie]

我看了下新的pr，感觉问题没这么简单，如果把wait状态的任务也加上的话会导致暂停然后恢复下载的任务进入wait状态了,就会抛弃本来已下载的文件，创建一个新的文件

[monkeyWie]

这个应该是另一个问题了，要再特殊处理下