Relay Peer failed due to OnTrack not set

[VacronBruce]

Your environment.

• Version: 68545cc
• Client: SFU to SFU relay
• Environement: Linode VM rocky8
• Are you using a TURN server? coturn
• Other Information - *
  https://github.com/pion/ion-sfu/blob/master/pkg/relay/relay.go , at line 428, when I check with onTrack callback it is nil*

What did you do?

SFU1 use p.Publisher.Relay()
SFU2 receive via sesson.AddRelayPeer()

What did you expect?

Should relay.receive() should have onTrack callback, and report via onTrack callback

What happened?

RTPReceiver for remoteTrack use before onTrack callback set.