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

app/models/account_suggestions/suggestion.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AccountSuggestions::Suggestion < ActiveModelSerializers::Model
+  attributes :account, :source
+
+  delegate :id, to: :account, prefix: true
+end