Update task executor to handle WorkflowAlreadyCompletedError for signal and cancel workflow

[Shaddoll]

What changed?
Update task executor to handle WorkflowAlreadyCompletedError for signal and cancel workflow

Why?
To surface correct error message to users

How did you test it?

Potential risks

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build 018f35c3-a953-42ab-893f-195eaa8cfabe

Details

• 26 of 27 (96.3%) changed or added relevant lines in 2 files are covered.
• 44 unchanged lines in 15 files lost coverage.
• Overall coverage increased (+0.01%) to 68.116%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
service/history/task/transfer_active_task_executor.go	16	17	94.12%

Files with Coverage Reduction	New Missed Lines	%
common/task/weighted_round_robin_task_scheduler.go	1	89.05%
common/task/parallel_task_processor.go	2	93.06%
common/peerprovider/ringpopprovider/config.go	2	81.58%
service/frontend/api/handler.go	2	62.07%
service/history/queue/transfer_queue_processor.go	2	57.05%
service/matching/matcher.go	2	90.72%
common/persistence/historyManager.go	2	66.67%
service/history/task/transfer_standby_task_executor.go	3	86.63%
service/history/task/task.go	3	84.81%
common/persistence/statsComputer.go	3	96.79%

Totals
Change from base Build 018f35ad-8edd-42d8-8be9-df8a2e4323b2:	0.01%
Covered Lines:	100031
Relevant Lines:	146853

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💛 - Coveralls

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 63.95%. Comparing base (d8124b2) to head (178b76e).

Additional details and impacted files

Files	Coverage Δ
...history/task/cross_cluster_source_task_executor.go	68.94% <100.00%> (+0.79%)	⬆️
...vice/history/task/transfer_active_task_executor.go	68.80% <85.71%> (+0.13%)	⬆️

... and 6 files with indirect coverage changes

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