Use Task SDK TaskInstanceState in OpenSearch log handler

[atamagrawal]

Replace the airflow.utils.state import with airflow.sdk in the OpenSearch task log
handler, so the provider relies on the Task SDK instead of airflow-core.

airflow.sdk.TaskInstanceState and airflow.utils.state.TaskInstanceState are two
independently defined (str, Enum) classes with matching member names and string values,
so this is a like-for-like import swap with no behaviour change. The provider requires
apache-airflow>=3.0.0, so airflow.sdk is always available and no version guard is
needed here, unlike providers that still support Airflow 2.11+.

Existing unit tests pass unmodified.

closes: #72409
related: #62063

---

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

• Yes (please specify the tool below)

Generated-by: Cursor (Claude Opus 5) following the guidelines

---

• 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.

[jroachgolf84]

Please check the CI failures!

[atamagrawal]

@jroachgolf84

The CI failure was in the Airflow 3.0.6 compatibility job, not in the normal provider tests.
What broke: On Airflow 3.0.6, TaskInstanceState is not available from airflow.sdk. Our first change used:

from airflow.sdk import TaskInstanceState
That works on newer Airflow, but on 3.0.6 it fails at import time.

Fix: Import it through the compat layer already used in this file:

from airflow.providers.common.compat.sdk import AirflowException, TaskInstanceState, conf
On newer Airflow it uses airflow.sdk. On 3.0.6 it falls back to airflow.utils.state. Same behavior, compatibility tests pass.

[atamagrawal]

@jroachgolf84 @rawwar Checking if you have comment or feedback on this PR.

[jroachgolf84]

Approved!

[jroachgolf84]

cc: @rawwar - do you mind taking a look?

[atamagrawal]

@jroachgolf84 , @rawwar Thanks, I see my PR is approved. But how can I merge it?

[boring-cyborg]

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