Marks Linux_android_emu android views to be unflaky (#142590)

<!-- meta-tags: To be used by the automation script only, DO NOT MODIFY.
{
  "name": "Linux_android_emu android views"
}
-->
The test has been passing for [50 consecutive runs](https://data.corp.google.com/sites/flutter_infra_metrics_datasite/flutter_check_test_flakiness_status_dashboard/?p=BUILDER_NAME:%22Linux_android_emu%20android%20views%22).
This test can be marked as unflaky.

.ci.yaml

@@ -351,7 +351,6 @@ targets:
 
   - name: Linux_android_emu android views
     recipe: devicelab/devicelab_drone
-    bringup: true
     properties:
       tags: >
         ["framework","hostonly","linux"]