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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[kamikazechaser]

@kanzihuang The shutdownTimeout will always re-queue jobs that did not complete before it quits. This PR changes behavior in that running tasks are stopped and requeued for next time without allowing the jobs to complete.

	// ShutdownTimeout specifies the duration to wait to let workers finish their tasks
	// before forcing them to abort when stopping the server.
	//
	// If unset or zero, default timeout of 8 seconds is used.

[kanzihuang]

@kanzihuang The shutdownTimeout will always re-queue jobs that did not complete before it quits. This PR changes behavior in that running tasks are stopped and requeued for next time without allowing the jobs to complete.

@kamikazechaser After receiving the exit signal, the server does not wait for the task to stop before exiting. The test code is as follows, and the problem can be reproduced:
test: stop active tasks before server shutdown

This PR only addresses the above issues and does not change behavior in that running tasks are stopped and requeued for next time without allowing the jobs to complete.