[execution_manager] Add unit tests for ConflictResolveWorkflowExecution

[3vilhamster]

What changed?
Added unit tests for ConflictResolveWorkflowExecution.

Why?
Improving unit tests coverage.

How did you test it?

Potential risks

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build 018fcfa6-57ec-44e8-9c83-8f24a3d2a3c1

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 24 unchanged lines in 8 files lost coverage.
• Overall coverage decreased (-0.003%) to 69.652%

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Files with Coverage Reduction	New Missed Lines	%
service/history/task/transfer_standby_task_executor.go	2	86.33%
service/matching/tasklist/task_list_manager.go	2	76.09%
service/history/execution/mutable_state_util.go	2	78.52%
service/history/queue/timer_queue_processor_base.go	3	77.87%
service/history/task/fetcher.go	3	85.57%
common/types/history.go	4	45.35%
service/history/engine/engineimpl/record_activity_task_started.go	4	68.87%
service/frontend/wrappers/metered/metered.go	4	66.67%

Totals
Change from base Build 018fcf32-23d9-4d7d-a579-94202b6c6918:	-0.003%
Covered Lines:	102993
Relevant Lines:	147868

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💛 - Coveralls