Add trends UI with admin and user settings (#11502)

app/models/form/admin_settings.rb

@@ -29,6 +29,7 @@ class Form::AdminSettings
     hero
     mascot
     spam_check_enabled
+    trends
   ).freeze
 
   BOOLEAN_KEYS = %i(
@@ -41,6 +42,7 @@ class Form::AdminSettings
     preview_sensitive_media
     profile_directory
     spam_check_enabled
+    trends
   ).freeze
 
   UPLOAD_KEYS = %i(

app/models/trending_tags.rb

@@ -66,6 +66,10 @@ class TrendingTags
     end
 
     def request_review!(tag)
+      return unless Setting.trends
+
+      tag.touch(:requested_review_at)
+
       User.staff.includes(:account).find_each { |u| AdminMailer.new_trending_tag(u.account, tag).deliver_later! if u.allows_trending_tag_emails? }
     end
   end

app/models/user.rb

@@ -107,7 +107,8 @@ class User < ApplicationRecord
   delegate :auto_play_gif, :default_sensitive, :unfollow_modal, :boost_modal, :delete_modal,
            :reduce_motion, :system_font_ui, :noindex, :theme, :display_media, :hide_network,
            :expand_spoilers, :default_language, :aggregate_reblogs, :show_application,
-           :advanced_layout, :use_blurhash, :use_pending_items, to: :settings, prefix: :setting, allow_nil: false
+           :advanced_layout, :use_blurhash, :use_pending_items, :trends,
+           to: :settings, prefix: :setting, allow_nil: false
 
   attr_reader :invite_code
   attr_writer :external