Avoid race condition when streaming deleted statuses (#10280)

* Avoid race condition when streaming deleted statuses

* Move redis lock to DistributionWorker to avoid extra Redis value

app/workers/distribution_worker.rb

@@ -4,7 +4,13 @@ class DistributionWorker
   include Sidekiq::Worker
 
   def perform(status_id)
-    FanOutOnWriteService.new.call(Status.find(status_id))
+    RedisLock.acquire(redis: Redis.current, key: "distribute:#{status_id}") do |lock|
+      if lock.acquired?
+        FanOutOnWriteService.new.call(Status.find(status_id))
+      else
+        raise Mastodon::RaceConditionError
+      end
+    end
   rescue ActiveRecord::RecordNotFound
     true
   end