Revert "Merge branch 'revert-4fabf83a' into 'develop'"

This reverts commit fe7fd33126, reversing
changes made to 4fabf83ad0.

test/notification_test.exs

@@ -69,16 +69,7 @@ defmodule Pleroma.NotificationTest do
   end
 
   describe "create_notification" do
-    setup do
-      GenServer.start(Streamer, %{}, name: Streamer)
-
-      on_exit(fn ->
-        if pid = Process.whereis(Streamer) do
-          Process.exit(pid, :kill)
-        end
-      end)
-    end
-
+    @tag needs_streamer: true
     test "it creates a notification for user and send to the 'user' and the 'user:notification' stream" do
       user = insert(:user)
       task = Task.async(fn -> assert_receive {:text, _}, 4_000 end)