* 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

* Change in-app links to keep you in-app

* refactor Permalink into Link

* rewrite link hrefs in status content

* please linter

* please linter again

* 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