Add missing IsolationGroups field in domain cache entry

[taylanisikdemir]

What changed?

DomainCache duplicates the entries before returning. It was missing IsolationGroups field.

TODO: This was identified while working on #5678 but sending as separate PR. Will rebase once the other one is merged.

Why?
To make sure the entries returned by domain cache is complete.

How did you test it?
unit tests

[coveralls]

Pull Request Test Coverage Report for Build 018dcd3f-55f1-43f8-951b-3bdeb4fcc924

Details

• -49 of 147 (66.67%) changed or added relevant lines in 10 files are covered.
• 43 unchanged lines in 8 files lost coverage.
• Overall coverage increased (+0.04%) to 62.777%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
host/dynamicconfig.go	2	4	50.0%
service/worker/asyncworkflow/async_workflow_consumer_manager.go	5	9	55.56%
host/integrationbase.go	0	5	0.0%
common/cache/domainCache.go	22	28	78.57%
host/onebox.go	22	54	40.74%

Files with Coverage Reduction	New Missed Lines	%
common/task/weighted_round_robin_task_scheduler.go	2	89.05%
service/matching/matcher.go	2	90.72%
common/persistence/nosql/nosqlplugin/cassandra/workflow.go	3	59.1%
service/history/task/fetcher.go	3	85.57%
service/frontend/wrappers/metered/metered.go	4	65.5%
service/history/task/transfer_standby_task_executor.go	4	87.01%
service/matching/taskListManager.go	5	79.7%
common/persistence/nosql/nosqlplugin/cassandra/workflow_parsing_utils.go	20	79.13%

Totals
Change from base Build 018dcce8-df73-46fe-8ff7-2acba6a12910:	0.04%
Covered Lines:	92768
Relevant Lines:	147774

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💛 - Coveralls