Generate parentClosePolicy task for x-cluster child

[yycptt]

What changed?

• Instead of always signaling system workflow for applying parent close policy for x-cluster child, generate x-cluster parent close policy task now that the bugs in that task implementation have been fixed.

Why?

• Revert temp workaround for x-cluster parent close policy task bug

How did you test it?

• Unit test.

Potential risks

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build 1cfb54f8-b603-4023-b82f-41d25db443e8

• 11 of 11 (100.0%) changed or added relevant lines in 1 file are covered.
• 89 unchanged lines in 16 files lost coverage.
• Overall coverage decreased (-0.05%) to 56.941%

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Files with Coverage Reduction	New Missed Lines	%
service/history/queue/timer_queue_processor_base.go	1	78.6%
client/history/client.go	2	39.33%
client/history/metricClient.go	2	46.37%
common/persistence/executionManager.go	2	76.57%
common/persistence/statsComputer.go	2	96.43%
common/task/fifoTaskScheduler.go	2	85.57%
service/history/handler.go	2	48.56%
service/history/queue/transfer_queue_processor.go	2	57.24%
service/matching/matcher.go	3	91.06%
service/frontend/workflowHandler.go	4	59.4%

Totals
Change from base Build 914edd1d-bdb8-44e1-abbb-61607e268479:	-0.05%
Covered Lines:	82836
Relevant Lines:	145478

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💛 - Coveralls