[tools] Temporarily make Node.js bot experimental

R=sergiyb@chromium.org,yangguo@chromium.org
NOTRY=true

Bug: v8:8397
Change-Id: I528642fe0cf023fab7d653e9370a0d5a39a6bbb4
Reviewed-on: https://chromium-review.googlesource.com/c/1310198Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57179}

infra/config/cq.cfg

@@ -90,7 +90,10 @@ verifiers {
         name: "v8_mac64_rel_ng_triggered"
         triggered_by: "v8_mac64_rel_ng"
       }
-      builders { name: "v8_node_linux64_rel" }
+      builders {
+        name: "v8_node_linux64_rel"
+        experiment_percentage: 100
+      }
       builders {
         name: "v8_presubmit"
         disable_reuse: true