HBASE-30155 MobFileCleanerChore does not shut down its internal execu…

[liuxiaocs7]

…… (#8222)

• for branch-2
• see: HBASE-30155

[Copilot]

Pull request overview

This PR addresses HBASE-30155 by ensuring MobFileCleanerChore properly tears down its internally managed ThreadPoolExecutor when the chore is shut down, preventing lingering executor threads after cleanup.

Changes:

• Override ScheduledChore.cleanup() in MobFileCleanerChore to shut down the internal executor.
• Add a focused unit test validating that shutdown() results in the executor being shut down.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
hbase-server/src/main/java/org/apache/hadoop/hbase/mob/MobFileCleanerChore.java	Adds cleanup() override to shut down the internal ThreadPoolExecutor on chore shutdown.
hbase-server/src/test/java/org/apache/hadoop/hbase/mob/TestMobFileCleanerChore.java	Adds a unit test asserting MobFileCleanerChore.shutdown() shuts down the internal executor.

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