The bots will be called win-trace-rel and linux-trace-rel. Currently
they work as clones of the compile bots. Once we add the recipe config
they'll also run the trace tests. They won't be added to the CQ.

Bug: angleproject:5530
Change-Id: I5457cc10860cc15a8a12e766ed2dfc6e4a4fa602
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2625170Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>