[Improvement-17724][TaskPlugin] EmrTask resource leak repair

[niumy0701]

Please refer to the details of main issue #14877
fix #17724

Purpose of the pull request

Brief change log

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This pull request is code cleanup without any test coverage.

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This pull request is already covered by existing tests, such as (please describe tests).

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Pull Request Notice

Pull Request Notice

If your pull request contains incompatible change, you should also add it to docs/docs/en/guide/upgrade/incompatible.md

[SbloodyS]

You should create an issue first and link to it. DSIP-23 is a main issue, and you need to create a sub issue. @niumy0701

[niumy0701]

You should create an issue first and link to it. DSIP-23 is a main issue, and you need to create a sub issue. @niumy0701

done
sub issue is #17724

[Copilot]

Pull request overview

This PR fixes resource leaks in the EMR task plugin by ensuring that the AWS EMR client is properly shut down after task execution completes or is cancelled. Previously, EMR client connections were not being released, which could lead to resource exhaustion over time in long-running DolphinScheduler instances.

• Added emrClient.shutdown() calls in trackApplicationStatus() and cancelApplication() methods for both EmrJobFlowTask and EmrAddStepsTask
• Refactored EmrAddStepsTask.cancelApplication() with try-finally block to guarantee cleanup even when exceptions occur
• Added test coverage to verify shutdown behavior in both success and failure scenarios

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
dolphinscheduler-task-plugin/dolphinscheduler-task-emr/src/main/java/org/apache/dolphinscheduler/plugin/task/emr/EmrJobFlowTask.java	Added emrClient.shutdown() calls in trackApplicationStatus() and cancelApplication() to fix resource leak
dolphinscheduler-task-plugin/dolphinscheduler-task-emr/src/main/java/org/apache/dolphinscheduler/plugin/task/emr/EmrAddStepsTask.java	Added emrClient.shutdown() in trackApplicationStatus() and wrapped cancelApplication() in try-finally to ensure cleanup
dolphinscheduler-task-plugin/dolphinscheduler-task-emr/src/test/java/org/apache/dolphinscheduler/plugin/task/emr/EmrJobFlowTaskTest.java	Added test to verify shutdown is called when cancelling job flow
dolphinscheduler-task-plugin/dolphinscheduler-task-emr/src/test/java/org/apache/dolphinscheduler/plugin/task/emr/EmrAddStepsTaskTest.java	Added tests to verify shutdown is called in error scenarios when cancelling steps

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[ruanwenjun]

same #17718 (review)

[niumy0701]

same #17718 (review)

There should be no problem, the resources have already been closed in the finally block