Tests that caller BWE can rampup even if callee can not demux incoming RTP packets. Bug: webrtc:14928 Change-Id: I3c89a14e67c6d781a26439980b5a99570a430dc7 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/299482 Commit-Queue: Per Kjellander <perkj@webrtc.org> Reviewed-by: Henrik Boström <hbos@webrtc.org> Reviewed-by: Erik Språng <sprang@webrtc.org> Cr-Commit-Position: refs/heads/main@{#39749}