Marks Linux_android opacity_peephole_grid_of_opacity_perf__e2e_summary to be flaky (#95860)

diff --git a/.ci.yaml b/.ci.yaml
index 737fe05..3aa157f 100755
--- a/.ci.yaml
+++ b/.ci.yaml
@@ -2256,6 +2256,7 @@
     scheduler: luci
 
   - name: Linux_android opacity_peephole_grid_of_opacity_perf__e2e_summary
+    bringup: true # Flaky https://github.com/flutter/flutter/issues/95859
     recipe: devicelab/devicelab_drone
     presubmit: false
     timeout: 60