Revert codecov patch threshold to 85%

[taylanisikdemir]

What changed?
I had to bypass 85% patch coverage threshold to split the history engine into multiple files in #5972.
It's merged so bringing the threshold back.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.09%. Comparing base (abfa99b) to head (8f7dde2).
Report is 1 commits behind head on master.

Additional details and impacted files

see 6 files with indirect coverage changes

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[coveralls]

Pull Request Test Coverage Report for Build 018f54af-8ded-45a2-b571-717c97db9d79

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 29 unchanged lines in 8 files lost coverage.
• Overall coverage increased (+0.04%) to 68.225%

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Files with Coverage Reduction	New Missed Lines	%
common/task/weighted_round_robin_task_scheduler.go	2	88.56%
service/history/task/transfer_active_task_executor.go	2	73.16%
service/matching/taskListManager.go	2	80.65%
common/task/fifo_task_scheduler.go	3	84.54%
service/worker/scanner/executor/runq.go	3	85.48%
common/persistence/statsComputer.go	3	96.79%
service/history/handler/handler.go	4	60.59%
service/history/task/transfer_standby_task_executor.go	10	86.83%

Totals
Change from base Build 018f54af-1427-4fbc-bc5d-7b9472685578:	0.04%
Covered Lines:	100217
Relevant Lines:	146892

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💛 - Coveralls