Change noisy frontend poll timeout log to debug level

[taylanisikdemir]

What changed?
Poll requests with timeout less than 20s causes a lot of noise in the logs. In total we see about 80% of the frontend logs is this single line: Context timeout is lower than critical value for long poll API.

There's not much value in keeping this as warning level so switching to debug level. Also adding domain name and task list tags to these logs

Why?
Reduce log noise.

[codecov]

Codecov Report

Merging #5725 (e3ca207) into master (50b4b84) will increase coverage by 0.02%.
Report is 1 commits behind head on master.
The diff coverage is 60.00%.

Additional details and impacted files

Files	Coverage Δ
common/util.go	77.94% <100.00%> (ø)
service/frontend/api/handler.go	38.46% <50.00%> (ø)

... and 8 files with indirect coverage changes

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[coveralls]

Pull Request Test Coverage Report for Build 018e10d5-6a1f-4cd2-88e3-6e48230dc0e7

Details

• 5 of 5 (100.0%) changed or added relevant lines in 2 files are covered.
• 75 unchanged lines in 13 files lost coverage.
• Overall coverage increased (+0.004%) to 63.219%

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Files with Coverage Reduction	New Missed Lines	%
client/history/client.go	2	38.1%
common/task/weighted_round_robin_task_scheduler.go	2	88.56%
service/history/execution/mutable_state_util.go	2	37.63%
service/history/handler/handler.go	2	49.59%
service/matching/taskReader.go	2	84.88%
common/persistence/statsComputer.go	3	94.64%
service/history/queue/timer_queue_processor_base.go	3	77.82%
service/history/task/fetcher.go	3	85.57%
service/frontend/api/handler.go	4	62.11%
service/history/task/transfer_standby_task_executor.go	4	86.19%

Totals
Change from base Build 018e10bf-df9b-47a4-889f-e9454573e538:	0.004%
Covered Lines:	92731
Relevant Lines:	146683

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💛 - Coveralls