Add fuchsia-angle-rel to the CQ

Unlike fuchsia_x64, this trybot builds with angle_top_of_tree, and won't
cause random patch failures.

Bug: angleproject:3146

Change-Id: Iea8f93c7e3b6c4bf4514a9c0c6eacca9bd3228c8
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1611730
Commit-Queue: Michael Spang <spang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>

infra/config/global/commit-queue.cfg

@@ -80,6 +80,9 @@ config_groups {
       builders {
         name: "chromium/try/android_angle_vk64_rel_ng"
       }
+      builders {
+        name: "chromium/try/fuchsia-angle-rel"
+      }
       builders {
         name: "chromium/try/linux_angle_deqp_rel_ng"
       }