Added a test for the GetworkflowExecution in the nosql_execution_store.go file.

[agautam478]

What changed?
To reduce duplication and improve the test file, I refactored the common setup into helper functions. This refactoring will focus on making the code more maintainable and concise.
Added two new test cases for the GetworkflowExecution.

I will add 5-6 more cases for this in the upcoming PR along with a test for UpdateWorkflowExecution.

Why?
To increase the code coverage.

How did you test it?
unit test

Potential risks
NA

Release notes
NA

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build 018ded46-e206-4359-adc1-aa5cf08f45c2

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 87 unchanged lines in 20 files lost coverage.
• Overall coverage decreased (-0.02%) to 62.856%

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Files with Coverage Reduction	New Missed Lines	%
common/persistence/sql/common.go	2	72.73%
common/persistence/sql/sqlplugin/mysql/db.go	2	83.33%
common/persistence/sql/sqlplugin/mysql/task.go	2	73.68%
common/persistence/sql/sqlplugin/postgres/db.go	2	85.0%
common/persistence/sql/sqlplugin/postgres/task.go	2	73.4%
common/task/parallel_task_processor.go	2	93.06%
common/task/weighted_round_robin_task_scheduler.go	2	89.05%
service/history/execution/mutable_state_builder.go	2	68.74%
service/history/shard/context.go	2	66.52%
service/matching/db.go	2	73.23%

Totals
Change from base Build 018de6a8-86c7-4d74-a3c6-13b680f6e3fd:	-0.02%
Covered Lines:	92903
Relevant Lines:	147804

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💛 - Coveralls