refactor: use slices.Contains to simplify

[zhedazijingang]

There is a new function added in the go1.21 standard library, which can make the code more concise and easy to read.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 26.44%. Comparing base (7886f4a) to head (b591306).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
server/model/task.go	0.00%	2 Missing ⚠️
server/pipeline/cancel.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5468   +/-   ##
=======================================
  Coverage   26.43%   26.44%           
=======================================
  Files         403      403           
  Lines       28805    28789   -16     
=======================================
- Hits         7616     7612    -4     
+ Misses      20494    20482   -12     
  Partials      695      695           

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