Set linux jumbo bot to 100% experiment

If it overloads the bot, it's not a real issue. Want to see if it can
handle full CQ load

Bug: 782863
Change-Id: I776efe034ce66bb12b0ea846c706d4e8e08b7893
Reviewed-on: https://chromium-review.googlesource.com/1080270Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563089}

infra/config/branch/cq.cfg

@@ -62,7 +62,7 @@ verifiers {
       builders { name: "linux-chromeos-rel" }
       builders {
         name: "linux-jumbo-rel"
-        experiment_percentage: 50
+        experiment_percentage: 100
       }
       builders { name: "linux-ozone-rel" }
       builders { name: "linux_chromium_compile_dbg_ng" }