{AKS} fix InvalidParameter error when add Machines nodepool

[HuShaoRu]

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Related command

az aks nodepool add --mode=Machines: remove unsupported fields when mode=Machines
also remove redundant live tests for Machines nodepools.

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[azure-client-tools-bot-prd]

Hi @HuShaoRu,
Please write the description of changes which can be perceived by customers into HISTORY.rst.
If you want to release a new extension version, please update the version in setup.py as well.

[yonzhan]

Thank you for your contribution! We will review the pull request and get back to you soon.

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[Copilot]

Pull request overview

Fixes az aks nodepool add --mode=Machines failing with InvalidParameter by ensuring Machines-mode nodepools are created with only supported properties, and updates tests accordingly.

Changes:

• Add Machines-mode handling in the agentpool decorator to reset/bypass unsupported fields when mode=Machines.
• Update scenario/unit tests to cover Machines-mode behavior and remove redundant scenario coverage.
• Update changelog entry for the fix and remove an obsolete test recording.

Reviewed changes

Copilot reviewed 5 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/aks-preview/azext_aks_preview/agentpool_decorator.py	Adds Machines-mode setup and skips other property setup when mode is Machines.
src/aks-preview/azext_aks_preview/tests/latest/test_agentpool_decorator.py	Adds unit test coverage for Machines-mode behavior in the decorator.
src/aks-preview/azext_aks_preview/tests/latest/test_aks_commands.py	Consolidates/updates scenario coverage for Machines nodepools and machine operations.
src/aks-preview/azext_aks_preview/tests/latest/recordings/test_aks_nodepool_create_machines_pool.yaml	Removes recording for a deleted redundant scenario test.
src/aks-preview/HISTORY.rst	Adds release note entry describing the Machines-mode InvalidParameter fix.

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[FumingZhang]

lgtm

Queued live test to validate the change.