In rtpbin we already systematically check for all property names except latency, correct that. In webrtcbin we need to check before trying to use the do-retransmission property. This is useful for the case where an element like identity gets passed to rtpbin's request-jitterbuffer property, when the application wants to use webrtcbin in an SFU situation, with no reordering and no added latency Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6112>