Add collection reach finder (#39346)

app/models/collection.rb

@@ -32,6 +32,7 @@ class Collection < ApplicationRecord
   has_many :collection_items, dependent: :delete_all
   has_many :accepted_collection_items, -> { accepted }, class_name: 'CollectionItem', inverse_of: :collection # rubocop:disable Rails/HasManyOrHasOneDependent
   has_many :collection_reports, dependent: :delete_all
+  has_many :accounts, -> { merge(CollectionItem.pending_or_accepted) }, through: :collection_items
 
   validates :name, presence: true
   validates :name, length: { maximum: 40 }, if: :local?