Setting up the feature flags

The flags for ACE-Monaco transition are described and explained in
the Epic: https://gitlab.com/groups/gitlab-org/-/epics/498

lib/gitlab/gon_helper.rb

@@ -43,6 +43,9 @@ module Gitlab
       # Initialize gon.features with any flags that should be
       # made globally available to the frontend
       push_frontend_feature_flag(:snippets_vue, default_enabled: false)
+      push_frontend_feature_flag(:monaco_snippets, default_enabled: false)
+      push_frontend_feature_flag(:monaco_blobs, default_enabled: false)
+      push_frontend_feature_flag(:monaco_ci, default_enabled: false)
     end
 
     # Exposes the state of a feature flag to the frontend code.