Change auto-following admin-selected accounts, show in recommendations (#16078)

app/models/account_suggestions.rb

@@ -1,17 +1,28 @@
 # frozen_string_literal: true
 
 class AccountSuggestions
-  class Suggestion < ActiveModelSerializers::Model
-    attributes :account, :source
-  end
+  SOURCES = [
+    AccountSuggestions::SettingSource,
+    AccountSuggestions::PastInteractionsSource,
+    AccountSuggestions::GlobalSource,
+  ].freeze
 
   def self.get(account, limit)
-    suggestions = PotentialFriendshipTracker.get(account, limit).map { |target_account| Suggestion.new(account: target_account, source: :past_interaction) }
-    suggestions.concat(FollowRecommendation.get(account, limit - suggestions.size, suggestions.map { |suggestion| suggestion.account.id }).map { |target_account| Suggestion.new(account: target_account, source: :global) }) if suggestions.size < limit
-    suggestions
+    SOURCES.each_with_object([]) do |source_class, suggestions|
+      source_suggestions = source_class.new.get(
+        account,
+        skip_account_ids: suggestions.map(&:account_id),
+        limit: limit - suggestions.size
+      )
+
+      suggestions.concat(source_suggestions)
+    end
   end
 
   def self.remove(account, target_account_id)
-    PotentialFriendshipTracker.remove(account.id, target_account_id)
+    SOURCES.each do |source_class|
+      source = source_class.new
+      source.remove(account, target_account_id)
+    end
   end
 end