Marks Mac run_debug_test_macos to be unflaky (#117470)

Co-authored-by: Chris Bracken <[email protected]>

Author: fluttergithubbot

.ci.yaml

@@ -4018,7 +4018,6 @@ targets:
 
   - name: Mac run_debug_test_macos
     recipe: devicelab/devicelab_drone
-    bringup: true
     timeout: 60
     properties:
       dependencies: >-