Add feature flag for easy toggling

app/views/layouts/_page.html.haml

@@ -5,7 +5,8 @@
     .mobile-overlay
     .alert-wrapper
       = render 'shared/outdated_browser'
-      = render_if_exists "layouts/header/ee_subscribable_banner"
+      - if Feature.enabled?(:subscribable_banner_license)
+        = render_if_exists "layouts/header/ee_subscribable_banner"
       = render "layouts/broadcast"
       = render "layouts/header/read_only_banner"
       = render "layouts/nav/classification_level_banner"

app/views/projects/_flash_messages.html.haml

@@ -8,5 +8,6 @@
     - unless project.empty_repo?
       = render 'shared/auto_devops_implicitly_enabled_banner', project: project
     = render_if_exists 'projects/above_size_limit_warning', project: project
-    = render_if_exists "layouts/header/ee_subscribable_banner", subscription: true
+    - if Feature.enabled?(:subscribable_banner_subscription)
+      = render_if_exists "layouts/header/ee_subscribable_banner", subscription: true
     = render_if_exists 'shared/shared_runners_minutes_limit', project: project, classes: [container_class, ("limit-container-width" unless fluid_layout)]