DOCS: Add downstream-relevant attributes to facilitate single sourcing

[sheilamjones]

This PR aims to update the upstream _attributes.adoc file with the additional attributes needed to migrate the Red Hat Deploying to OpenShift Container Platform guide to the upstream Quarkus community and to facilitate the single-sourcing of the guide back downstream.

For more information, see QDOCS-1082

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[sheilamjones]

Hi @gsmet, @rolfedh, @iocanel,
To migrate the Deploy to OpenShift guide from downstream to upstream, I need to add additional attributes to the upstream _attributes.adoc file. This will help facilitate the migration of the content from downstream to upstream and to single source this content back downstream for RHBQ 3.20.
Kind regards,
Sheila

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🎊 PR Preview 6a87ab6 has been successfully built and deployed to https://quarkus-pr-main-45962-preview.surge.sh/version/main/guides/

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