Add back missing fields in server logs and remove double log

[cheukt]

used to look like

2025-01-24T17:53:02.436Z        ERROR   rdk.networking  goutils-cheuk/logger.go:161  finished unary call with code InvalidArgument   {"error":"rpc error: code = InvalidArgument desc = host not preconfigured","grpc.code":"InvalidArgument","grpc.time_ms":0.078,"grpc.start_time":"2025-01-24T17:53:02.436Z"}

and now it looks like

2025-01-24T17:57:09.728Z        ERROR   rdk.networking  goutils-cheuk/logger.go:161  finished unary call with code InvalidArgument   {"error":"rpc error: code = InvalidArgument desc = host not preconfigured","grpc.code":"InvalidArgument","grpc.time_ms":0.091,"grpc.start_time":"2025-01-24T17:57:09.727Z","grpc.request.deadline":"2025-01-24T17:57:19.722Z","span.kind":"server","system":"grpc","grpc.service":"proto.rpc.webrtc.v1.SignalingService","grpc.method":"OptionalWebRTCConfig"}

also removed the double logs. We can consider shifting context.Canceled/io.ClosedPipe errors down to debug to mimic the existing filtering, but we can decide on that later

[bashar-515]

nice