[code-coverage] Add tests for history decision task handler

[ketsiambaku]

What changed? Introduced the following tests in service/history/decision:

• TestHandleDecisionRecordMarker

• TestHandleDecisionScheduleActivity

• TestHandleDecisionCancelWorkflow

Why? improve code coverage in the package

How did you test it? unit tests

Potential risks

Release notes

Documentation Changes

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 67.99%. Comparing base (edc5880) to head (22bfd07). Report is 3 commits behind head on master.

Additional details and impacted files

[see 11 files with indirect coverage changes](https://app.codecov.io/gh/uber/cadence/pull/6060/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uber) ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/uber/cadence/pull/6060?dropdown=coverage&src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uber). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uber) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/uber/cadence/pull/6060?dropdown=coverage&src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uber). Last update [edc5880...22bfd07](https://app.codecov.io/gh/uber/cadence/pull/6060?dropdown=coverage&src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uber). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=uber).

[coveralls]

Pull Request Test Coverage Report for Build 018fabc6-df68-4d1a-b108-9517f6a6deb1

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 116 unchanged lines in 15 files lost coverage.
• Overall coverage increased (+0.02%) to 69.5%

---

Files with Coverage Reduction	New Missed Lines	%
common/task/weighted_round_robin_task_scheduler.go	2	89.05%
service/matching/tasklist/task_list_manager.go	2	76.48%
common/persistence/sql/sqlplugin/mysql/task.go	2	73.68%
service/history/task/transfer_active_task_executor.go	2	72.72%
service/matching/tasklist/matcher.go	2	88.66%
service/history/task/fetcher.go	2	85.57%
common/persistence/sql/sqlplugin/mysql/db.go	2	79.49%
service/worker/scanner/executor/runq.go	3	85.48%
common/archiver/filestore/historyArchiver.go	4	80.95%
service/frontend/api/handler.go	6	62.2%
<!--	Total:	116		-->

Totals
Change from base Build 018faadd-0f68-4f46-a937-a0c09b154ebd:	0.02%
Covered Lines:	102455
Relevant Lines:	147418

---

💛 - Coveralls