Add ignore_flakiness property to staging builds. (flutter#104102)

* Add ignore_flakiness property to staging builds.

Bug:104100

* Update .ci.yaml

Author: yusuf-goog

.ci.yaml

@@ -18,6 +18,7 @@ platform_properties:
         ]
       os: Ubuntu
       device_type: none
+      ignore_flakiness: "true"
   linux:
     properties:
       dependencies: >-
@@ -2244,6 +2245,7 @@ targets:
     recipe: flutter/flutter
     timeout: 60
     properties:
+      ignore_flakiness: "true"
       tags: >
         ["framework","hostonly"]
       validation: analyze
@@ -2255,6 +2257,7 @@ targets:
     recipe: flutter/flutter_drone
     timeout: 60
     properties:
+      ignore_flakiness: "true"
       dependencies: >-
         [
           {"dependency": "goldctl"},