CPP: Style the "Campaign Page Type" in Search results

In search results, 'Campaigns' should be presented with a different style than Evergreen pages, posts of documents.

See example here > https://www.greenpeace.org/international/?s=climate+emergency&orderby=_score

As mentioned in Rocketchat, Magali Fatome was against pulling Campaign pages with the same style of the Take Action Pages, but we are a campaigning organisation, so these type of results should certainly be presented in a different way that regular content.

The "Campaign" content type should be visible in the search preview to distinguish Campaign pages apart from other.

cc William Morris-Julien Gabor Galgocz Kelli Tolen