Enable Environment Dashboard by default

Remove current_user from Feature check
Add default_enabled: true

changelogs/unreleased/enable-environment-dashboard-on-prod.yml

+---
+title: Enable environments dashboard by default
+merge_request: 19838
+author:
+type: added

ee/app/controllers/operations_controller.rb

@@ -57,7 +57,7 @@ class OperationsController < ApplicationController
   end
 
   def environments_dashboard_feature_flag
-    render_404 unless Feature.enabled?(:environments_dashboard, current_user)
+    render_404 unless Feature.enabled?(:environments_dashboard, current_user, default_enabled: true)
   end
 
   def load_projects(current_user)

ee/app/helpers/ee/dashboard_helper.rb

@@ -39,7 +39,7 @@ module EE
         links << :analytics if ::Gitlab::Analytics.any_features_enabled?
 
         if can?(current_user, :read_operations_dashboard)
-          links << :environments if ::Feature.enabled?(:environments_dashboard, current_user)
+          links << :environments if ::Feature.enabled?(:environments_dashboard, current_user, default_enabled: true)
           links << :operations
         end