feat: update cluster setup scripts for ONTAP 9 unified compatibility

[mahatvagarg]

Summary

Update cluster setup scripts for ONTAP 9 unified compatibility. Simplifies node discovery by removing version-specific field-set fallback logic and using a single unified field set that works across all ONTAP 9.x releases.

Changes

• Python (cluster_setup_basic.py): Replaced 3-tier _NODE_FIELDS_SETS fallback with a single _NODE_FIELDS tuple; removed shebang and orchestrio reference.
• Ansible (cluster_setup.yml): Removed disaggregated,san_optimized from node_query_fields; updated play name.

Checklist

General

• No secrets, credentials, or API tokens in code or config

If touching python/

• Scripts compile (python -m py_compile python/*.py)
• Lint passes (ruff check python/)

If touching ansible/

• Syntax check passes (ansible-playbook --syntax-check)
• ansible-lint passes

Test Report

Environment: N/A — cannot run end-to-end
Platform version: Target: ONTAP 9.8+
Style touched: python, ansible

Static verification

• python3 -m py_compile python/cluster_setup_basic.py — OK
• YAML parse of ansible/cluster_setup.yml — OK
• Changes are field-list reduction only (removed disaggregated,san_optimized); no new API calls, no logic changes.

Cannot run on a cluster?

This script performs initial cluster creation from unclustered nodes — it requires
two fresh ONTAP Simulator VMs in pre-cluster state. The change is a pure simplification:

1. Python: replaced the 3-tier field-set fallback (_NODE_FIELDS_SETS) with a single
   _NODE_FIELDS tuple using the base ONTAP 9 fields. No behavioral change for ONTAP 9.8+.
2. Ansible: removed disaggregated,san_optimized from node_query_fields to match.

Both files compile/parse cleanly. The removed fields (disaggregated, san_optimized)
were only available on ONTAP 9.18+/9.19+ — removing them makes the scripts work uniformly
across all ONTAP 9.x versions without the fallback retry loop.

Please apply the needs-test-run label so a maintainer with an unclustered simulator
environment can validate before merge.

Related issues

[github-actions]

Test Report looks present - thanks. Reviewers will verify the captured output and idempotency evidence.