Add unit tests for CreateWorkflowExecution

[Shaddoll]

What changed?
Add unit tests for CreateWorkflowExecution

Why?
Improve coverage

How did you test it?
unit tests

Potential risks

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build 018e0c58-8577-45de-8bcb-8cdfd4e82def

Details

• 12 of 12 (100.0%) changed or added relevant lines in 1 file are covered.
• 45 unchanged lines in 10 files lost coverage.
• Overall coverage increased (+0.02%) to 63.013%

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Files with Coverage Reduction	New Missed Lines	%
service/history/queue/timer_queue_processor_base.go	1	78.23%
common/persistence/sql/sqlplugin/mysql/db.go	2	83.33%
common/persistence/sql/sqlplugin/mysql/task.go	2	73.68%
common/task/parallel_task_processor.go	2	93.06%
service/matching/matcher.go	2	90.72%
common/persistence/statsComputer.go	3	94.64%
service/history/task/task_util.go	4	75.14%
service/history/task/transfer_standby_task_executor.go	4	86.6%
common/persistence/sql/workflowStateMaps.go	11	85.56%
service/history/execution/mutable_state_task_refresher.go	14	64.24%

Totals
Change from base Build 018e0bc4-bc99-45c7-b336-b5d3a2984942:	0.02%
Covered Lines:	93135
Relevant Lines:	147804

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💛 - Coveralls