Shard tag not needed in shard.Context

[vytautas-karpavicius]

What changed?
Removing redundant tag.ShardID

Why?
We use already tagged logger from historyShardsItem.

How did you test it?
Started server locally and checked that logs from shard.Context still have shard-id tag.

Potential risks

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build 0180f1eb-3487-4da8-b063-dc7a811a17f5

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• 68 unchanged lines in 10 files lost coverage.
• Overall coverage decreased (-0.04%) to 56.842%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
service/history/shard/context.go	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
common/peerprovider/ringpopprovider/config.go	2	81.58%
common/task/weightedRoundRobinTaskScheduler.go	2	89.12%
service/history/shard/context.go	2	65.26%
service/history/task/transfer_active_task_executor.go	2	71.36%
service/matching/taskListManager.go	2	73.77%
common/persistence/nosql/nosqlplugin/cassandra/workflow.go	3	55.49%
service/history/queue/transfer_queue_processor.go	10	56.86%
common/persistence/nosql/nosqlplugin/cassandra/workflowUtils.go	12	77.59%
service/history/execution/mutable_state_task_refresher.go	14	69.3%
common/persistence/nosql/nosqlplugin/cassandra/workflowParsingUtils.go	19	86.32%

Totals
Change from base Build 0180f1cd-876e-494d-b583-5375349c2aa3:	-0.04%
Covered Lines:	83733
Relevant Lines:	147308

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💛 - Coveralls