Replace airflow.utils.state import with airflow.sdk in Common AI Provider

[simar-rekhi]

The Common AI HITL review plugin now imports TaskInstanceState from airflow.sdk instead of airflow.utils.state. The import stays inside the existing Airflow 3.1+ guard.

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Drafted-by: Cursor Grok 4.6 following the guidelines; reviewed and edited by @simar-rekhi before posting

[boring-cyborg]

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[SameerMesiah97]

Have you updated the relevant import in the corresponding test module i.e test_hitl_review.py?

[boring-cyborg]

Awesome work, congrats on your first merged pull request! You are invited to check our Issue Tracker for additional contributions.