Simplify `AccountSummary.filtered` query generation (#28868)

app/models/account_summary.rb

@@ -12,9 +12,11 @@
 class AccountSummary < ApplicationRecord
   self.primary_key = :account_id
 
+  has_many :follow_recommendation_suppressions, primary_key: :account_id, foreign_key: :account_id, inverse_of: false
+
   scope :safe, -> { where(sensitive: false) }
   scope :localized, ->(locale) { where(language: locale) }
-  scope :filtered, -> { joins(arel_table.join(FollowRecommendationSuppression.arel_table, Arel::Nodes::OuterJoin).on(arel_table[:account_id].eq(FollowRecommendationSuppression.arel_table[:account_id])).join_sources).where(FollowRecommendationSuppression.arel_table[:id].eq(nil)) }
+  scope :filtered, -> { where.missing(:follow_recommendation_suppressions) }
 
   def self.refresh
     Scenic.database.refresh_materialized_view(table_name, concurrently: false, cascade: false)