Add a theme about logging improvements

[wallrj]

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Explain how to use the new UseDomainQualifiedFinalizer feature gate. As suggested by @jsoref in https://github.com/cert-manager/website/pull/1565#issuecomment-2383519095

• https://github.com/cert-manager/website/pull/1565#issuecomment-2383519095

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jsoref, SgtCoDFish

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