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/models/tag.rb

@@ -36,6 +36,7 @@ class Tag < ApplicationRecord
   scope :usable, -> { where(usable: [true, nil]) }
   scope :listable, -> { where(listable: [true, nil]) }
   scope :trendable, -> { Setting.trendable_by_default ? where(trendable: [true, nil]) : where(trendable: true) }
+  scope :not_trendable, -> { where(trendable: false) }
   scope :recently_used, ->(account) { joins(:statuses).where(statuses: { id: account.statuses.select(:id).limit(1000) }).group(:id).order(Arel.sql('count(*) desc')) }
   scope :matches_name, ->(term) { where(arel_table[:name].lower.matches(arel_table.lower("#{sanitize_sql_like(Tag.normalize(term))}%"), nil, true)) } # Search with case-sensitive to use B-tree index
 
@@ -75,28 +76,12 @@ class Tag < ApplicationRecord
     requested_review_at.present?
   end
 
-  def use!(account, status: nil, at_time: Time.now.utc)
-    TrendingTags.record_use!(self, account, status: status, at_time: at_time)
-  end
-
-  def trending?
-    TrendingTags.trending?(self)
+  def requires_review_notification?
+    requires_review? && !requested_review?
   end
 
   def history
-    days = []
-
-    7.times do |i|
-      day = i.days.ago.beginning_of_day.to_i
-
-      days << {
-        day: day.to_s,
-        uses: Redis.current.get("activity:tags:#{id}:#{day}") || '0',
-        accounts: Redis.current.pfcount("activity:tags:#{id}:#{day}:accounts").to_s,
-      }
-    end
-
-    days
+    @history ||= Trends::History.new('tags', id)
   end
 
   class << self