The new bot runs WPT tests. Also add a os_from_name helper which doesn't impact .cfg files. Change-Id: I31cb70e54ce0e3028981269bf5da43c1af113a63 Bug: b/265906442 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/304281 Reviewed-by: Christoffer Jansson <jansson@webrtc.org> Commit-Queue: Jeremy Leconte <jleconte@google.com> Cr-Commit-Position: refs/heads/main@{#39993}