feat(retina): add disable network observability command for update

[FumingZhang]

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• add disable network observability command for update cluster and adds tests.
• This was also mentioned in this issue No argument in the az aks update command to disable network observability (azure-cli-extension/aks-preview) #6740.
• PR forked from feat(retina): add disable network observability command for update #6894 (to resolve conflicts).

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

Related command

• az aks update --disable-network-observability

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? (pip install wheel==0.30.0 required)

For new extensions:

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

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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 update	cmd aks update added parameter disable_network_observability

[azure-client-tools-bot-prd]

Hi @FumingZhang,
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.

[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]

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