Add collection reach finder (#39346)

app/workers/activitypub/collection_raw_distribution_worker.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class ActivityPub::CollectionRawDistributionWorker < ActivityPub::RawDistributionWorker
+  def perform(json, collection_id, exclude_inboxes = [])
+    @collection = Collection.find(collection_id)
+
+    super(json, @collection.account_id, exclude_inboxes)
+  end
+
+  private
+
+  def inboxes
+    @inboxes ||= CollectionReachFinder.new(@collection).inboxes
+  end
+end