fix: stop active tasks before server shutdown

[kanzihuang]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 68.73%. Comparing base (8df0bfa) to head (cc2d5d6).
Report is 4 commits behind head on master.

❗ Current head cc2d5d6 differs from pull request most recent head 86c772f

Please upload reports for the commit 86c772f to get more accurate results.

Files	Patch %	Lines
processor.go	84.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #878      +/-   ##
==========================================
+ Coverage   68.41%   68.73%   +0.31%     
==========================================
  Files          27       28       +1     
  Lines        3841     3857      +16     
==========================================
+ Hits         2628     2651      +23     
+ Misses        929      919      -10     
- Partials      284      287       +3     

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