Add EE logic to forms environment scope field

app/views/projects/clusters/gcp/_form.html.haml

@@ -9,7 +9,10 @@
     = field.text_field :name, class: 'form-control', placeholder: s_('ClusterIntegration|Cluster name')
   .form-group
     = field.label :environment_scope, s_('ClusterIntegration|Environment scope')
-    = field.text_field :environment_scope, class: 'form-control js-select-on-focus', disabled: true, placeholder: s_('ClusterIntegration|Environment scope')
+    - if project.feature_available?(:multiple_clusters)
+      = field.text_field :environment_scope, class: 'form-control js-select-on-focus', placeholder: s_('ClusterIntegration|Environment scope')
+    - else
+      = field.text_field :environment_scope, class: 'form-control js-select-on-focus', disabled: true, placeholder: s_('ClusterIntegration|Environment scope')
 
   = field.fields_for :provider_gcp, @cluster.provider_gcp do |provider_gcp_field|
     .form-group

app/views/projects/clusters/user/_form.html.haml

@@ -5,7 +5,10 @@
     = field.text_field :name, class: 'form-control', placeholder: s_('ClusterIntegration|Cluster name')
   .form-group
     = field.label :environment_scope, s_('ClusterIntegration|Environment scope')
-    = field.text_field :environment_scope, class: 'form-control js-select-on-focus', disabled: true, placeholder: s_('ClusterIntegration|Environment scope')
+    - if project.feature_available?(:multiple_clusters)
+      = field.text_field :environment_scope, class: 'form-control js-select-on-focus', placeholder: s_('ClusterIntegration|Environment scope')
+    - else
+      = field.text_field :environment_scope, class: 'form-control js-select-on-focus', disabled: true, placeholder: s_('ClusterIntegration|Environment scope')
 
   = field.fields_for :platform_kubernetes, @cluster.platform_kubernetes do |platform_kubernetes_field|
     .form-group