Change the previous GN configs to build GYP instead (since we'll keep GYP around for a while) but exclude tests and examples for that config, since we'll only support the production code for GYP. Add new configs for upcoming rename of those bots to GYP instead of GN. BUG=webrtc:5949 NOTRY=True TBR=ehmaldonado@webrtc.org Review-Url: https://codereview.webrtc.org/2291443002 Cr-Commit-Position: refs/heads/master@{#13980}