Fix DockerOperator on_kill to respect auto_remove='force' and remove …

[jangByeongHui]

Fix DockerOperator.on_kill() to respect auto_remove='force' and remove orphaned containers

When auto_remove='force' is set and a task is killed (e.g. timeout, manual
stop), on_kill() called cli.stop() but never called cli.remove_container().
This left the container running as an orphan even though the user explicitly
requested force-removal.

This PR adds a remove_container(force=True) call inside on_kill() when
auto_remove == "force", matching the behaviour that already exists in the
normal execution path. APIError is caught and logged (not re-raised) because
on_kill is best-effort — the container may already be gone by the time the
call is made.

closes: #56149

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Was generative AI tooling used to co-author this PR?

• Yes — Claude (claude-sonnet-4-6)

Generated-by: Claude (claude-sonnet-4-6) following the guidelines

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