[CQ] Make node integration bot mandatory for CQ

NOTRY=true
TBR=franzih@chromium.org

Bug: v8:6154
Change-Id: Ief1e1acb353ba1c857616c32607979aec462207a
Reviewed-on: https://chromium-review.googlesource.com/509488Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45416}

infra/config/cq.cfg

@@ -32,10 +32,7 @@ verifiers {
     buckets {
       name: "master.tryserver.v8"
       builders { name: "v8_android_arm_compile_rel" }
-      builders {
-        name: "v8_node_linux64_rel"
-        experiment_percentage: 100
-      }
+      builders { name: "v8_node_linux64_rel" }
       builders { name: "v8_linux64_asan_rel_ng" }
       builders {
         name: "v8_linux64_asan_rel_ng_triggered"