[Improvement-18311][Task] Support killing shell task process group

[qiuyanjun888]

Was this PR generated or assisted by AI?

YES. AI assisted with code implementation and PR preparation. I reviewed the changes before submission.

Purpose of the pull request

Improve shell task termination by making the task process run in its own process group, so the worker can kill the whole shell task process group instead of relying only on the parent process tree.

Closes #18311.

Brief change log

• Add a configurable shell task process group kill switch.
• Wrap local Linux shell task commands with process-group setup support.
• Add process-group kill utilities for shell task termination.
• Add unit coverage for shell interceptor process-group command generation and process-group kill behavior.
• Document the new configuration in common properties, Helm values, and configuration docs.

Verify this pull request

This change added tests and can be verified as follows:

• ./mvnw -pl dolphinscheduler-task-plugin/dolphinscheduler-task-api -am -Dspotless.check.skip=true -Djacoco.skip=true -Dtest=ProcessUtilsTest,BaseLinuxShellInterceptorBuilderTest test

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]

setsid can also lead to orphan process. Compared with the current way, there is no optimization. I'll close this PR until reach consensus in #18311