Add trending links (#16917)

* 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

app/lib/activitypub/activity.rb

@@ -129,8 +129,6 @@ class ActivityPub::Activity
   end
 
   def crawl_links(status)
-    return if status.spoiler_text?
-
     # Spread out crawling randomly to avoid DDoSing the link
     LinkCrawlWorker.perform_in(rand(1..59).seconds, status.id)
   end

app/lib/activitypub/activity/announce.rb

@@ -22,9 +22,8 @@ class ActivityPub::Activity::Announce < ActivityPub::Activity
         visibility: visibility_from_audience
       )
 
-      original_status.tags.each do |tag|
-        tag.use!(@account)
-      end
+      Trends.tags.register(@status)
+      Trends.links.register(@status)
 
       distribute(@status)
     end

app/lib/activitypub/activity/create.rb

@@ -164,9 +164,14 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
   def attach_tags(status)
     @tags.each do |tag|
       status.tags << tag
-      tag.use!(@account, status: status, at_time: status.created_at) if status.public_visibility?
+      tag.update(last_status_at: status.created_at) if tag.last_status_at.nil? || (tag.last_status_at < status.created_at && tag.last_status_at < 12.hours.ago)
     end
 
+    # If we're processing an old status, this may register tags as being used now
+    # as opposed to when the status was really published, but this is probably
+    # not a big deal
+    Trends.tags.register(status)
+
     @mentions.each do |mention|
       mention.status = status
       mention.save