Fix unbounded recursion in post discovery (#23506)

* Add a limit to how many posts can get fetched as a result of a single request

* Add tests

* Always pass `request_id` when processing `Announce` activities

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Co-authored-by: nametoolong <nametoolong@users.noreply.github.com>

app/workers/activitypub/fetch_replies_worker.rb

@@ -6,8 +6,8 @@ class ActivityPub::FetchRepliesWorker
 
   sidekiq_options queue: 'pull', retry: 3
 
-  def perform(parent_status_id, replies_uri)
-    ActivityPub::FetchRepliesService.new.call(Status.find(parent_status_id), replies_uri)
+  def perform(parent_status_id, replies_uri, options = {})
+    ActivityPub::FetchRepliesService.new.call(Status.find(parent_status_id), replies_uri, **options.deep_symbolize_keys)
   rescue ActiveRecord::RecordNotFound
     true
   end