Add feature flag `:geo_object_storage_replication`

ee/app/views/admin/geo/nodes/_form.html.haml

@@ -70,12 +70,13 @@
     = form.number_field :minimum_reverification_interval, class: 'form-control col-sm-2', min: 1
     .form-text.text-muted= s_('Geo|Control the minimum interval in days that a repository should be reverified for this primary node')
 
-.form-group.row.js-hide-if-geo-primary{ class: ('hidden' unless geo_node.secondary?) }
-  .col-sm-10
-    = form.label :sync_object_storage, _('Object Storage replication'), class: 'label-bold'
-    .form-check
-      = form.check_box :sync_object_storage, class: 'form-check-input'
-      = form.label :sync_object_storage, class: 'form-check-label' do
-        %span= s_('Geo|Allow GitLab to replicate content on Object Storage')
-      .form-text.text-muted= s_('Geo|If enabled, GitLab will perform Object Storage replication using Geo')
+- if ::Feature.enabled?(:geo_object_storage_replication)
+  .form-group.row.js-hide-if-geo-primary{ class: ('hidden' unless geo_node.secondary?) }
+    .col-sm-10
+      = form.label :sync_object_storage, _('Object Storage replication'), class: 'label-bold'
+      .form-check
+        = form.check_box :sync_object_storage, class: 'form-check-input'
+        = form.label :sync_object_storage, class: 'form-check-label' do
+          %span= s_('Geo|Allow GitLab to replicate content on Object Storage')
+        .form-text.text-muted= s_('Geo|If enabled, GitLab will perform Object Storage replication using Geo')
 

ee/lib/ee/api/entities.rb

@@ -485,7 +485,7 @@ module EE
         expose :repos_max_capacity
         expose :verification_max_capacity
         expose :container_repositories_max_capacity
-        expose :sync_object_storage, if: ->(geo_node, _) { geo_node.secondary? }
+        expose :sync_object_storage, if: ->(geo_node, _) { ::Feature.enabled?(:geo_object_storage_replication) && geo_node.secondary? }
 
         # Retained for backwards compatibility. Remove in API v5
         expose :clone_protocol do |_record, _options|