fix: task manager panic in some cases

[lxl66566]

Depends-On: #918
fix #919

[mergify]

@lxl66566 Convert your pr to draft since CI failed

[codecov]

Codecov Report

Attention: Patch coverage is 73.68421% with 10 lines in your changes missing coverage. Please review.

Project coverage is 76.09%. Comparing base (e35b35a) to head (7c29d0a).
Report is 297 commits behind head on master.

Files with missing lines	Patch %	Lines
crates/utils/src/task_manager/tasks.rs	0.00%	4 Missing ⚠️
crates/utils/src/task_manager/mod.rs	91.66%	0 Missing and 2 partials ⚠️
crates/xline/src/server/lease_server.rs	50.00%	0 Missing and 2 partials ⚠️
crates/xline/src/server/watch_server.rs	66.66%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #925      +/-   ##
==========================================
+ Coverage   75.55%   76.09%   +0.53%     
==========================================
  Files         180      189       +9     
  Lines       26938    28855    +1917     
  Branches    26938    28855    +1917     
==========================================
+ Hits        20353    21957    +1604     
- Misses       5366     5557     +191     
- Partials     1219     1341     +122     

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[github-actions]

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[mergify]

@lxl66566 Your PR is in conflict and cannot be merged.

[mergify]

@lxl66566 Convert your pr to draft since CI failed