Revert "[ACS] az aks create: Pre-announce --no-ssh-key default behaviour breaking change"

[a0x1ab]

Reverts #32205
[Breaking change to be released in the following iteration]

[azure-client-tools-bot-prd]

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[azure-client-tools-bot-prd]

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[yonzhan]

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[github-actions]

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Please sync the latest code with latest dev branch (for azure-cli) or main branch (for azure-cli-extensions).
After that please run the following commands to enable git hooks:

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[Copilot]

Pull Request Overview

This PR reverts a previously added breaking change announcement for az aks create command's SSH key behavior. The revert removes the pre-announcement of a breaking change that would make --no-ssh-key the default behavior when no SSH key parameters are provided.

• Removes breaking change registration logic for AKS SSH key behavior
• Cleans up the breaking change announcement file by removing import and registration code
• Reverts to previous state before the breaking change announcement was added

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[Copilot]

Incomplete license header comment. The closing line should match the opening format with full dashes.

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