Sending an EOS event is actually really bad because rtpbin doesn't handle that very well. It was only being used as a way to notify webrtcbin to check if re-negotiation is needed. We don't need that anymore, since changing the direction is enough to notify webrtcbin to check for re-negotiation. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5045>