fix: start swarm for engine tests

Author: doorgan

apps/engine/test/test_helper.exs

@@ -1,6 +1,6 @@
 Application.ensure_all_started(:snowflake)
 Application.ensure_all_started(:refactorex)
-{"", 0} = System.cmd("epmd", ~w(-daemon))
+Application.ensure_all_started(:swarm)
 random_number = :rand.uniform(500)
 
 with :nonode@nohost <- Node.self() do