Update ExternalWiki integration to use description DSL
What does this MR do and why?
Based on !139687 (merged), we're updating ExternalWiki
integration to use the same attribute.
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
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How to set up and validate locally
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