fix(task_manager.h): 首次tick超时任务没有重置

[vbirds]

首次tick，task_timeout_timer_里的超时任务没有重置

[owent]

感谢修复，可否也修复一下单元测试和下面 C++20 协程的相同问题（1310行）？
或者仅修复一下单元测试，C++20协程的相同BUG我自己晚点来也行。
之前单元测试也是有问题的，导致没检测出来。

[vbirds]

感谢修复，可否也修复一下单元测试和下面 C++20 协程的相同问题（1310行）？ 或者仅修复一下单元测试，C++20协程的相同BUG我自己晚点来也行。 之前单元测试也是有问题的，导致没检测出来。

提交了，韬哥帮review下代码

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04 🎉

Comparison is base (3302f3e) 89.78% compared to head (8d460d9) 89.83%.

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Additional details and impacted files

@@            Coverage Diff             @@
##               v2      #46      +/-   ##
==========================================
+ Coverage   89.78%   89.83%   +0.04%     
==========================================
  Files          36       36              
  Lines        2761     2773      +12     
==========================================
+ Hits         2479     2491      +12     
  Misses        282      282              

Impacted Files	Coverage Δ
include/libcotask/task_manager.h	87.64% <100.00%> (+0.28%)	⬆️

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[owent]

task_mgr->tick(8); 还是需要保留哈，这是用来确保tick(8)的时候定时器还没有执行删除的。