Added more tests for nosql_execution_store.go

[agautam478]

What changed?
Added tests for the following:
ListConcreteExecutions, GetTransferTasks, and GetCrossClusterTasks

Added 1 success and one failure for each for now. The goal is to cover all functions in the file and then expand on the negative code paths.

Why?
As a part of code coverage initiative.

How did you test it?
unit tests

Potential risks

Release notes

Documentation Changes

[codecov]

Codecov Report

Merging #5738 (3aeb018) into master (9526e4b) will decrease coverage by 0.40%.
The diff coverage is n/a.

❗ Current head 3aeb018 differs from pull request most recent head b9a72ac. Consider uploading reports for the commit b9a72ac to get more accurate results

Additional details and impacted files

see 14 files with indirect coverage changes

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[coveralls]

Pull Request Test Coverage Report for Build 018e1a15-ff02-4e36-9123-10876d595c5a

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 36 unchanged lines in 9 files lost coverage.
• Overall coverage increased (+0.03%) to 63.913%

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Files with Coverage Reduction	New Missed Lines	%
common/peerprovider/ringpopprovider/config.go	2	81.58%
common/task/fifo_task_scheduler.go	2	82.47%
service/frontend/api/handler.go	2	62.17%
service/history/task/transfer_standby_task_executor.go	2	86.19%
service/matching/taskReader.go	2	84.88%
service/history/task/fetcher.go	4	86.08%
common/archiver/filestore/historyArchiver.go	4	80.95%
service/matching/taskListManager.go	5	80.2%
service/frontend/wrappers/metered/metered.go	13	62.02%

Totals
Change from base Build 018e1771-8482-4aa6-97a2-9711c7cbdb6f:	0.03%
Covered Lines:	93696
Relevant Lines:	146599

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💛 - Coveralls