Move Mac_build_test flutter_gallery__transition_perf_e2e_ios out of staging (#142987)

Move test out of staging now that https://github.com/flutter/flutter/issues/142917 is fixed.

.ci.yaml

@@ -4790,7 +4790,6 @@ targets:
   - name: Mac_build_test flutter_gallery__transition_perf_e2e_ios
     recipe: devicelab/devicelab_drone_build_test
     presubmit: false
-    bringup: true
     timeout: 60
     properties:
       tags: >