Also test the field trial with valid parameter and non-empty suffix. Bug: webrtc:7494 Change-Id: I3d871b41dd71c951ac56e180b3c09cda4c3627d4 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/251441 Reviewed-by: Hanna Silen <silen@webrtc.org> Commit-Queue: Alessio Bazzica <alessiob@webrtc.org> Cr-Commit-Position: refs/heads/main@{#36031}