Stale issues gh action [WIP]

[ibarrajo]

What changed?
Added a github action to tag and close stale issues and pull requests.

Timelines to close and tags to be exempted are to be discussed.

Why?

How did you test it?

Potential risks

Release notes

Documentation Changes

[codecov]

Codecov Report

Merging #5729 (2ecc28f) into master (88cfab0) will increase coverage by 0.07%.
Report is 5 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

see 13 files with indirect coverage changes

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[coveralls]

Pull Request Test Coverage Report for Build 018e1160-1af4-430b-8ee5-57a5eb74fe5a

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 127 unchanged lines in 12 files lost coverage.
• Overall coverage decreased (-0.06%) to 63.137%

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Files with Coverage Reduction	New Missed Lines	%
common/persistence/historyManager.go	2	66.67%
common/persistence/sql/sqlplugin/postgres/db.go	2	80.0%
common/persistence/sql/sqlplugin/postgres/task.go	2	73.4%
common/task/fifo_task_scheduler.go	2	80.41%
common/task/weighted_round_robin_task_scheduler.go	2	88.56%
service/history/execution/mutable_state_task_refresher.go	2	64.24%
service/history/task/fetcher.go	2	85.57%
service/history/queue/timer_queue_processor_base.go	3	77.82%
service/history/task/transfer_standby_task_executor.go	4	87.01%
service/history/task/cross_cluster_task_processor.go	8	80.79%

Totals
Change from base Build 018e10f1-ea04-47e7-9f09-e8c4fb27206c:	-0.06%
Covered Lines:	92600
Relevant Lines:	146665

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💛 - Coveralls