[azure-iot] Exempt digital-twin update authentication default from lint

[Hangyi (HangyiWang)]

Summary

Add a parameter-scoped no_parameter_defaults_for_update_commands exemption for iot hub digital-twin update / auth_type_dataplane.

The default key selects request authentication; it does not update a digital-twin property. This follows the existing exemptions for iot hub device-twin update, device-identity update, module-twin update, and other Hub update commands.

The same exemption already exists in the IoT extension repository, where release lint applies it. The index repository was missing it, causing the external-wheel linter to report a HIGH-severity finding for the published preview.

Scope

• Only linter_exclusions.yml changes: five added lines.
• The exemption applies to one rule on one parameter of one command.
• No index entries, release artifacts, runtime behavior, or other lint rules change.

Related: #10432. The 1.0.0b2 index proposal remains a separate, index-only PR.

Validation

• Loaded the published azure-iot 1.0.0b2 wheel in an isolated extension directory and ran the actual azdev 0.2.13 rule against its command table.
• Reproduced the HIGH-severity finding with the original exclusions (exit code 1); the added exemption makes the same rule pass (exit code 0).
• Confirmed the parsed YAML differs only by the new entry and that it exactly matches the existing device-twin update exemption.
• git diff --check passed.

[Copilot]

Copilot review overview

🟢 Approval recommended

The narrowly scoped exemption matches established neighboring entries and the upstream extension configuration.

Review effort: Balanced
Findings: None

What changed in this PR

Adds the missing parameter-scoped lint exemption for Azure IoT digital-twin authentication defaults.

Changes:

• Exempts auth_type_dataplane on iot hub digital-twin update from the update-default rule.
• Aligns lint behavior with related IoT Hub commands and the IoT extension repository.

File	Description
linter_exclusions.yml	Adds the targeted digital-twin lint exemption.

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