Add new cluster property to what's new

[Feediver1]

Description

Resolves https://redpandadata.atlassian.net/browse/
Review deadline: Tuesday, Nov 18th

Doc team: feel free to add new properties from your features in this PR.

Preview

New cluster properties

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch Feediver1-patch-3

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[JakeSCahill]

@Feediver1 let’s close this one and use #1452

[Feediver1]

Closing in lieu of #1452