Marks Linux_android flavors_test to be unflaky (#120299)

Author: fluttergithubbot

.ci.yaml

@@ -1776,7 +1776,6 @@ targets:
       task_name: fast_scroll_large_images__memory
 
   - name: Linux_android flavors_test
-    bringup: true
     recipe: devicelab/devicelab_drone
     presubmit: false
     timeout: 60