Marks Linux_mokey new_gallery__crane_perf to be flaky (#165964)

<!-- meta-tags: To be used by the automation script only, DO NOT MODIFY.
{
  "name": "Linux_mokey new_gallery__crane_perf"
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Issue link: flutter/flutter#165963

Author: fluttergithubbot

.ci.yaml

@@ -3002,6 +3002,7 @@ targets:
 
   # linux mokey benchmark
   - name: Linux_mokey new_gallery__crane_perf
+    bringup: true # Flaky https://github.com/flutter/flutter/issues/165963
     recipe: devicelab/devicelab_drone
     presubmit: false
     timeout: 60