Marks Mac_ios large_image_changer_perf_ios to be unflaky (#104627)

Author: fluttergithubbot

.ci.yaml

@@ -3349,7 +3349,6 @@ targets:
     scheduler: luci
 
   - name: Mac_ios large_image_changer_perf_ios
-    bringup: true # Flaky https://github.com/flutter/flutter/issues/101059
     recipe: devicelab/devicelab_drone
     presubmit: false
     timeout: 60