[AIP-94] Add airflowctl Tasks List Command

[ColtenOuO]

Adds airflowctl tasks list <dag_id> [--order-by], backed by the existing GET /dags/{dag_id}/tasks Public API endpoint, and marks the core airflow tasks list command with @deprecated_for_airflowctl.

related: #68402 [AIP-94] airflowctl command migration

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

• Yes — Claude Code (Opus 5) for writing Tests.

[potiuk]

Heads-up: I merged #69274 earlier today and it has just put this PR into conflict — apologies, the overlap wasn't visible until I went looking.

#69274 marked the tasks CLI commands as migrated, which included adding exactly the two lines this PR also adds:

• @deprecated_for_airflowctl("airflowctl tasks list") on task_list in airflow-core/src/airflow/cli/commands/task_command.py (now on main)
• (task_command.task_list, "airflowctl tasks list") in test_command_deprecations.py

This branch is ~133 commits behind main, so both will collide on rebase. The fix is simply to drop them from this PR — they're already on main — and keep the airflowctl side, which is the actual substance here.

Same situation applies to #69397 (tasks failed-deps), which I've flagged there too. Worth knowing the pattern: the AIP-94 marker PRs and the airflowctl command PRs touch the same two core files, so whichever lands first obliges the other to rebase.

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Drafted-by: Claude Code (Opus 5); reviewed by @potiuk before posting

[ColtenOuO]

Thanks for the heads-up! Rebased onto latest main and dropped both duplicated lines

[ColtenOuO]

I think the failing Airflow CTL tests check doesn't come from this PR (?

The tasks list tests had passed