Fix context leak in pinot integration test

[neil-xie]

What changed?
Fix context leak in pinot integration test
Context leak was fixed in #5377, but pinot integration test is missed.

Why?

How did you test it?

Potential risks

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build 018dd1bf-9ff9-4b77-9158-bd99bd26af44

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 95 unchanged lines in 19 files lost coverage.
• Overall coverage decreased (-0.03%) to 62.754%

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Files with Coverage Reduction	New Missed Lines	%
common/persistence/sql/common.go	2	72.73%
common/persistence/sql/sqlplugin/mysql/db.go	2	83.33%
common/persistence/sql/sqlplugin/mysql/task.go	2	73.68%
common/task/weighted_round_robin_task_scheduler.go	2	88.06%
service/history/task/transfer_active_task_executor.go	2	72.38%
service/history/task/transfer_standby_task_executor.go	2	86.6%
service/matching/db.go	2	73.23%
common/log/tag/tags.go	3	50.18%
service/history/execution/mutable_state_task_refresher.go	3	58.86%
service/history/queue/timer_queue_processor_base.go	3	77.82%

Totals
Change from base Build 018dd1a9-2e9f-4a05-80b0-faec19a35f2d:	-0.03%
Covered Lines:	92750
Relevant Lines:	147800

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💛 - Coveralls