Fix SplitHTTP race condition when creating new sessions (#3533)

Co-authored-by: nobody <nobody@nowhere.mars>
Co-authored-by: mmmray <142015632+mmmray@users.noreply.github.com>

transport/internet/splithttp/splithttp_test.go

@@ -63,8 +63,8 @@ func Test_listenSHAndDial(t *testing.T) {
 	}
 
 	common.Must(conn.Close())
-	<-time.After(time.Second * 5)
 	conn, err = Dial(ctx, net.TCPDestination(net.DomainAddress("localhost"), listenPort), streamSettings)
+
 	common.Must(err)
 	_, err = conn.Write([]byte("Test connection 2"))
 	common.Must(err)