Write tests for reconciliation fetcher

[taylanisikdemir]

What changed?

• Added/updated unit tests for reconciliation fetcher folder
• Renamed some files to snake_case

Why?
Increase coverage

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.96%. Comparing base (01baea8) to head (d2f6d8f).
Report is 1 commits behind head on master.

Additional details and impacted files

Files with missing lines	Coverage Δ
common/persistence/data_manager_interfaces.go	94.91% <ø> (ø)
common/persistence/operation_mode_validator.go	86.22% <ø> (ø)
common/persistence/queue_manager.go	0.00% <ø> (ø)
...ommon/persistence/visibility_manager_interfaces.go	0.00% <ø> (ø)

... and 6 files with indirect coverage changes

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