Add tests for DeleteHistoryBranch

[jakobht]

What changed?
Added tests for DeleteHistoryBranch

Why?

How did you test it?

Potential risks

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build 018f1ee9-712b-497b-83a3-ede42ed2ab94

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 48 unchanged lines in 8 files lost coverage.
• Overall coverage decreased (-0.005%) to 67.778%

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Files with Coverage Reduction	New Missed Lines	%
common/persistence/sql/sqlplugin/postgres/task.go	2	73.4%
common/task/fifo_task_scheduler.go	2	83.51%
service/history/execution/mutable_state_builder.go	2	71.09%
service/history/queue/transfer_queue_processor.go	2	57.17%
service/matching/matcher.go	2	90.72%
service/history/task/transfer_standby_task_executor.go	9	86.63%
common/persistence/sql/sqlplugin/postgres/db.go	9	65.0%
service/history/task/task_util.go	20	70.57%

Totals
Change from base Build 018f1c52-079d-4525-90c9-6009c700fa94:	-0.005%
Covered Lines:	99489
Relevant Lines:	146786

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💛 - Coveralls

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.75%. Comparing base (cf2f77a) to head (607b6d9).

Additional details and impacted files

see 8 files with indirect coverage changes

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