Marks Linux_android cubic_bezier_perf_sksl_warmup__e2e_summary to be unflaky (#104089)

Author: fluttergithubbot

.ci.yaml

@@ -1499,7 +1499,6 @@ targets:
     scheduler: luci
 
   - name: Linux_android cubic_bezier_perf_sksl_warmup__e2e_summary
-    bringup: true # Flaky https://github.com/flutter/flutter/issues/103504
     recipe: devicelab/devicelab_drone
     presubmit: false
     timeout: 60