Marks drive_perf_debug_warning to be unflaky (#181277)

Infra issue has resolved
https://github.com/flutter/flutter/issues/174111, and the test has been
passing for [50 consecutive
runs](https://data.corp.google.com/sites/dash_infra_metrics_datasite/flutter_check_test_flakiness_status_dashboard/?p=BUILDER_NAME:%22Linux_pixel_7pro%20drive_perf_debug_warning%22).

.ci.yaml

diff --git a/.ci.yaml b/.ci.yaml
index f316783..73855c6 100644
--- a/.ci.yaml
+++ b/.ci.yaml
@@ -2625,7 +2625,6 @@
       task_name: devtools_profile_start_test
 
   - name: Linux_pixel_7pro drive_perf_debug_warning
-    bringup: true # Flaky https://github.com/flutter/flutter/issues/174111
     recipe: devicelab/devicelab_drone
     presubmit: false
     timeout: 60