Currently linking directly to Knowledge Explorer topics shows a generic onebox, which isn't super helpful in some cases.
This commit mimics how the theme creator plugin handles adding metadata to special occurrences. However, to get this to work, how the plugin handles showing topic contents needed to be refactored. Instead of hitting the existing topic route, the plugin implements its own version of this, including adding restrictions for topics that are not in a selected Knowledge Explorer category or tag.
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