Move windows engine_v2 to prod.

Windows engine_v2 are now generating the expected artifacts and ready to
be moved to the production environment.

Bug: flutter/flutter#81855

.ci.yaml

@@ -466,15 +466,13 @@ targets:
 
   - name: Windows windows_android_aot_engine
     recipe: engine_v2/engine_v2
-    bringup: true
     timeout: 60
     properties:
       release_build: "true"
       config_name: windows_android_aot_engine
 
   - name: Windows windows_host_engine
     recipe: engine_v2/engine_v2
-    bringup: true
     timeout: 60
     properties:
       release_build: "true"