[Fix-18311][TaskPlugin] Fix task process kill status check

[zhuxiangyi]

Was this PR generated or assisted by AI?

YES. Codex/ChatGPT assisted with debugging, code changes, tests, issue drafting, and PR draft preparation. I reviewed the changes and verified them locally.

Purpose of the pull request

Fix task kill status checking when kill -0 returns Operation not permitted for an unkillable sudo parent process or when tenant login shell emits stderr with exit code 0.

Closes #18311.

Brief change log

• Add exit code accessor to ExitCodeException.
• Distinguish alive, not-alive, and no-permission process states in ProcessUtils.
• Continue killing permitted child processes instead of reporting success when only the sudo parent check is denied.
• Add unit coverage for sudo parent denied plus killable child processes.

Verify this pull request

This change added tests and can be verified as follows:

• ./mvnw -pl dolphinscheduler-common,dolphinscheduler-task-plugin/dolphinscheduler-task-api -DskipTests -Djacoco.skip=true spotless:check
• ./mvnw -pl dolphinscheduler-task-plugin/dolphinscheduler-task-api -am -Dspotless.check.skip=true -Djacoco.skip=true -Dsurefire.failIfNoSpecifiedTests=false -Dtest=ProcessUtilsTest 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.

[sonarqubecloud]

Quality Gate failed

Failed conditions
0.0% Coverage on New Code (required ≥ 60%)

See analysis details on SonarQube Cloud