* Fix /api/v1/admin/trends/tags using wrong serializer
Fix regression from #18641
* Only use `REST::Admin::TagSerializer` when the user can `manage_taxonomies`
* Fix admin trending hashtag component to not link if `id` is unknown
* Add trending links
* Add overriding specific links trendability
* Add link type to preview cards and only trend articles
Change trends review notifications from being sent every 5 minutes to being sent every 2 hours
Change threshold from 5 unique accounts to 15 unique accounts
* Fix tests