Disable the checks ensuring we reject mixed-codec simulcast when the field trial is enabled. The feature is however not yet implemented. Bug: webrtc:362277533 Change-Id: Ib1601767c951d61aaa37a3d8767d0a81444d626c Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/361404 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Florent Castelli <orphis@webrtc.org> Cr-Commit-Position: refs/heads/main@{#42942}