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>

spec/services/fetch_remote_status_service_spec.rb

@@ -15,7 +15,7 @@ RSpec.describe FetchRemoteStatusService, type: :service do
   end
 
   context 'protocol is :activitypub' do
-    subject { described_class.new.call(note[:id], prefetched_body) }
+    subject { described_class.new.call(note[:id], prefetched_body: prefetched_body) }
     let(:prefetched_body) { Oj.dump(note) }
 
     before do