Marks Linux_android flutter_gallery__transition_perf_e2e to be unflaky (#105620)

Author: fluttergithubbot

.ci.yaml

@@ -1980,7 +1980,6 @@ targets:
   - name: Linux_android flutter_gallery__transition_perf_e2e
     recipe: devicelab/devicelab_drone
     presubmit: false
-    bringup: true
     timeout: 60
     properties:
       tags: >