Oban.Pro.Relay.async may cause genservers to die on timeout

[caioaao]

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Environment

• Oban Version 1.4.13
• PostgreSQL Version: 14.x
• Elixir & Erlang/OTP Versions (elixir --version): erlang 27.1; elixir 1.17.3

Current Behavior

1. Call Oban.Pro.Relay.async(...) |> Oban.Pro.Relay.await() from inside a GenServer process
2. await() times out
3. Job finishes after await() timeout
4. The {:notification, :relay, %{...}} message is produced, but this time it is caught by the GenServer receive loop. If there's no handle_info to deal with this, the GenServer will die with an error something like this:

GenServer #PID<*> terminating ** (FunctionClauseError) no function clause matching in MyApp.Server.handle_info/2     (foo 0.1.0) lib/my_app/server.ex:31: MyApp.Server.handle_info({:notification, :relay, %{"ref" => "*", "result" => ...})

Expected Behavior

The choice of using a {:notification, :relay} message passed to the calling process shouldn't leak outside of the Relay.async and Relay.await functions