[AKS] support premium tier and add supportPlan

[FumingZhang]

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This checklist is used to make sure that common guidelines for a pull request are followed.

Description

Close: #6753

Related command

• az aks create
• az aks update

General Guidelines

• Have you run azdev style <YOUR_EXT> locally? (pip install azdev required)
• Have you run python scripts/ci/test_index.py -q locally?

For new extensions:

• My extension description/summary conforms to the Extension Summary Guidelines.

About Extension Publish

There is a pipeline to automatically build, upload and publish extension wheels.
Once your pull request is merged into main branch, a new pull request will be created to update src/index.json automatically.
You only need to update the version information in file setup.py and historical information in file HISTORY.rst in your PR but do not modify src/index.json.

[azure-client-tools-bot-prd]

⚠️Azure CLI Extensions Breaking Change Test

⚠️aks-preview

rule	cmd_name	rule_message	suggest_message
⚠️ 1006 - ParaAdd	aks create	cmd aks create added parameter k8s_support_plan
⚠️ 1010 - ParaPropUpdate	aks create	cmd aks create update parameter tier: updated property choices from ['free', 'standard'] to ['free', 'premium', 'standard']
⚠️ 1006 - ParaAdd	aks update	cmd aks update added parameter k8s_support_plan
⚠️ 1010 - ParaPropUpdate	aks update	cmd aks update update parameter tier: updated property choices from ['free', 'standard'] to ['free', 'premium', 'standard']

[azure-client-tools-bot-prd]

Hi @FumingZhang,
Since the current milestone time is less than 7 days, this pr will be reviewed in the next milestone.

[yonzhan]

AKS

[azclibot]

[Release] Update index.json for extension [ aks-preview ] : https://dev.azure.com/azclitools/internal/_build/results?buildId=92927&view=results