Add unit tests for TaskInfo types and utility functions

[timl3136]

What changed?
Add more unit tests for several -info types and utility functions

Why?
Increase test coverage and stability of the platform

How did you test it?
Unit test

Potential risks

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build 018e161f-684d-4394-8f80-44f5d3551d80

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 84 unchanged lines in 10 files lost coverage.
• Overall coverage increased (+0.02%) to 63.803%

---

Files with Coverage Reduction	New Missed Lines	%
common/task/fifo_task_scheduler.go	2	85.57%
common/task/weighted_round_robin_task_scheduler.go	2	89.05%
service/history/execution/mutable_state_builder.go	2	68.74%
service/history/task/transfer_active_task_executor.go	2	72.38%
service/history/task/redispatcher.go	4	89.53%
service/history/task/task_util.go	4	75.14%
common/persistence/nosql/nosqlplugin/cassandra/workflow.go	6	63.03%
service/history/task/transfer_standby_task_executor.go	8	86.19%
service/history/execution/mutable_state_task_refresher.go	15	64.24%
common/persistence/nosql/nosqlplugin/cassandra/workflow_parsing_utils.go	39	79.13%

Totals
Change from base Build 018e1613-5a84-4b9d-978a-cd89a943d096:	0.02%
Covered Lines:	93534
Relevant Lines:	146599

---

💛 - Coveralls

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@3b5dc47). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head 587a302 differs from pull request most recent head a836190. Consider uploading reports for the commit a836190 to get more accurate results

Additional details and impacted files

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3b5dc47...a836190. Read the comment docs.