feat: add disable_artifact_streaming arg for nodepool update in aks preview

[KananMehta]

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Validation for Breaking Change Starting...

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Hi @KananMehta,
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.

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Pull request overview

This PR extends the aks-preview Azure CLI extension to support explicitly disabling artifact streaming on AKS nodepools via az aks nodepool update, including validation, wiring into the agentpool decorator, help text, and tests.

Changes:

• Add --disable-artifact-streaming to az aks nodepool update (params, help, decorator update logic).
• Add/extend validation to enforce mutual exclusivity with --enable-artifact-streaming and restrict usage to Linux nodepools.
• Update unit tests, linter exclusions, changelog, and bump extension version to 19.0.0b26.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/aks-preview/setup.py	Bumps extension version to 19.0.0b26.
src/aks-preview/linter_exclusions.yml	Adds linter exclusion entry for the new disable_artifact_streaming parameter.
src/aks-preview/HISTORY.rst	Documents the new --disable-artifact-streaming flag in Pending.
src/aks-preview/azext_aks_preview/tests/latest/test_validators.py	Adds validator coverage for --disable-artifact-streaming and mutual exclusivity.
src/aks-preview/azext_aks_preview/tests/latest/test_agentpool_decorator.py	Adds decorator/context tests for reading and applying disable_artifact_streaming.
src/aks-preview/azext_aks_preview/custom.py	Adds the new parameter to the aks_agentpool_update custom command signature.
src/aks-preview/azext_aks_preview/agentpool_decorator.py	Adds context getter and update logic to set artifact_streaming_profile.enabled = False.
src/aks-preview/azext_aks_preview/_validators.py	Enhances validation for mutual exclusivity and Windows OS restriction.
src/aks-preview/azext_aks_preview/_params.py	Registers the new CLI argument for aks nodepool update.
src/aks-preview/azext_aks_preview/_help.py	Adds help entry for --disable-artifact-streaming.

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