[AIP-94] Mark connections commands as migrated to airflowctl

[yuseok89]

related: #68402

Marks the migratable connections CLI commands (list, add, delete, test, create-default-connections, import) with the maintainer-facing @deprecated_for_airflowctl marker, per the converted direction in #68402. Existing implementations are unchanged.
connections import is left out for now. It has no airflowctl equivalent yet.

Someone mentioned picking up connections in #68402, but I didn't see a PR after 2+ weeks, so I went ahead with this. Happy to coordinate or step back if it's already in progress.

---

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

• Yes (please specify the tool below)
  • Opus 4.8

---

• Read the Pull Request Guidelines for more information. Note: commit author/co-author name and email in commits become permanently public when merged.
• For fundamental code changes, an Airflow Improvement Proposal (AIP) is needed.
• When adding dependency, check compliance with the ASF 3rd Party License Policy.
• For significant user-facing changes create newsfragment: {pr_number}.significant.rst, in airflow-core/newsfragments. You can add this file in a follow-up commit after the PR is created so you know the PR number.

[henry3260]

Thanks!

[henry3260]

I think we have airflowctl connections import now

airflow/airflow-ctl/src/airflowctl/ctl/commands/connection_command.py

Line 35 in 4b25735

def import_(args, api_client=NEW_API_CLIENT) -> None:

[yuseok89]

I think we have airflowctl connections import now

Good catch.
I missed that one.
Thanks for the heads-up!

[henry3260]

LGTM!

[Prab-27]

@yuseok89 Happy to see this !

I was woking on it but busy on fixing failed prek hook - env and other
Thanks !!

[potiuk]

LGTM — verified the six connections commands match the tracked set (#68402), the airflowctl replacement strings are correct, and the marker is a no-op attribute setter. Thanks.

[potiuk]

You need to resolve merge conflicts though.

[github-actions]

Hi maintainer, this PR was merged without a milestone set.
We've automatically set the milestone to Airflow 3.3.1 based on: backport label targeting v3-3-test
If this milestone is not correct, please update it to the appropriate milestone.

This comment was generated by Milestone Tag Assistant.

[github-actions]

Backport successfully created: v3-3-test

Note: As of Merging PRs targeted for Airflow 3.X
the committer who merges the PR is responsible for backporting the PRs that are bug fixes (generally speaking) to the maintenance branches.

In matter of doubt please ask in #release-management Slack channel.

Status	Branch	Result
✅	v3-3-test