Add linux-jumbo-rel builder to main CQ

Bug: 782863
Change-Id: I6f4fb63fe1ed9c56a4f5238f1b0ca37c1c3a0715
Reviewed-on: https://chromium-review.googlesource.com/1087762Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565056}

infra/config/branch/cq.cfg

@@ -61,10 +61,7 @@ verifiers {
         experiment_percentage: 10
       }
       builders { name: "linux-chromeos-rel" }
-      builders {
-        name: "linux-jumbo-rel"
-        experiment_percentage: 100
-      }
+      builders { name: "linux-jumbo-rel" }
       builders { name: "linux-ozone-rel" }
       builders { name: "linux_chromium_compile_dbg_ng" }
       builders { name: "linux_chromium_asan_rel_ng" }