{MYSQL} Remove parameter restriction for --high-availability and add breaking change annoucement

[linyudoa]

Related command

mysql flexible-server create
mysql flexible-server update

Description

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• The PR title and description has followed the guideline in Submitting Pull Requests.

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[azure-client-tools-bot-prd]

Validation for Azure CLI Full Test Starting...

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[azure-client-tools-bot-prd]

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

[azure-client-tools-bot-prd]

Validation for Breaking Change Starting...

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[yonzhan]

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

[microsoft-github-policy-service]

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

[github-actions]

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