remove deprecated debian-11 image

[sudheer-quad]

This PR removes the deprecated debian-11 image family from ansible-vm blueprint.

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[gemini-code-assist]

Summary of Changes

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This pull request cleans up the ansible-vm blueprint by removing support for the deprecated debian-11 operating system image. This ensures that the test suite remains aligned with current supported OS versions.

Highlights

• Cleanup: Removed the deprecated debian-11 image configuration from the ansible-vm blueprint.
• Dependency Update: Updated the deployment group references to exclude the removed debian-11 workstation instance.

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[gemini-code-assist]

Code Review

This pull request removes the Debian 11 workstation deployment group and its associated reference from the Ansible VM daily tests blueprint. I have no feedback to provide as there are no review comments.

[SwarnaBharathiMantena]

LGTM

[Neelabh94]

I see debian 11 is mentioned/ used at multiple places in our codebase, any specific reason to not remove/ replace all of them together? Ref : https://github.com/search?q=repo%3AGoogleCloudPlatform%2Fcluster-toolkit+debian-11&type=code