Reland: "infra: Re-migrate linux-ozone-rel to Goma RBE"

Reverted in
https://chromium-review.googlesource.com/c/chromium/src/+/1792505

Changes in reland: migrate correct builder instead of linux-gcc-rel.

Migration schedule:
https://docs.google.com/spreadsheets/d/1TZhpasm6iceYm7zqkyEtZ1wn9ZcpREfH4LV4cusICJA/edit#gid=0

======== Original CL contents ==========

This was previously reverted due to reaching the Goma RBE server
capacity limit.
https://chromium-review.googlesource.com/c/chromium/src/+/1786872

The limit has since been increased.

Bug: 1001231,950413
Change-Id: Ie036dd49599f0e2ee8695b363958d87396cfb465
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1792584Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Simon Que <sque@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695417}

infra/config/cr-buildbucket.cfg

@@ -1791,7 +1791,7 @@ buckets {
 
     builders {
       name: "linux-ozone-rel"
-      mixins: "linux-ci"
+      mixins: "linux-ci-goma-rbe-prod"
       mixins: "builderless"
     }
 
@@ -4491,6 +4491,7 @@ buckets {
     builders {
       mixins: "builderless"
       mixins: "linux-try"
+      mixins: "goma-rbe-prod"
       name: "linux-ozone-rel"
       mixins: "builderless"
     }

infra/config/luci-milo.cfg

@@ -3093,6 +3093,11 @@ consoles {
     category: "week2.5|linux"
     short_name: "gpu"
   }
+  builders {
+    name: "buildbucket/luci.chromium.ci/linux-ozone-rel"
+    category: "week3a|linux"
+    short_name: "ozone"
+  }
   builders {
     name: "buildbucket/luci.chromium.ci/linux-annotator-rel"
     category: "week3a|linux"