Revert RBE migrations for linux-{jumbo,ozone}-rel.

Tbr: martiniss@chromium.org,sque@chromium.org
Bug: 1001231,950413
Change-Id: Ic49b1ca112bc81e444aa5fe8c8787f9ab28c2616
No-Try: true
No-Presubmit: true
No-Tree-Checks: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1786872Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693920}

infra/config/cr-buildbucket.cfg

@@ -1777,7 +1777,7 @@ buckets {
 
     builders {
       name: "linux-ozone-rel"
-      mixins: "linux-ci-goma-rbe-prod"
+      mixins: "linux-ci"
       mixins: "builderless"
     }
 
@@ -4447,11 +4447,9 @@ buckets {
       mixins: "linux-try"
       name: "linux-gcc-rel"
       mixins: "builderless"
-      mixins: "goma-rbe-prod"
     }
     builders {
       mixins: "linux-try"
-      mixins: "goma-rbe-prod"
       name: "linux-jumbo-rel"
       mixins: "builderless"
     }
@@ -4466,7 +4464,6 @@ buckets {
     builders {
       mixins: "builderless"
       mixins: "linux-try"
-      mixins: "goma-rbe-prod"
       name: "linux-ozone-rel"
       mixins: "builderless"
     }

infra/config/luci-milo.cfg

@@ -3088,11 +3088,6 @@ 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"