Convert instance level clusters enabled to class method

app/models/clusters/instance.rb

@@ -10,7 +10,7 @@ module Clusters
       ::Feature.enabled?(feature, default_enabled: true)
     end
 
-    def instance_clusters_enabled?
+    def self.enabled?
       ::Feature.enabled?(:instance_clusters, default_enabled: true)
     end
   end

app/models/concerns/deployment_platform.rb

@@ -38,7 +38,7 @@ module DeploymentPlatform
   end
 
   def find_instance_cluster_platform_kubernetes_with_feature_guard(environment: nil)
-    return unless instance_clusters_enabled?
+    return unless Clusters::Instance.enabled?
 
     find_instance_cluster_platform_kubernetes(environment: environment)
   end
@@ -49,10 +49,6 @@ module DeploymentPlatform
       .first&.platform_kubernetes
   end
 
-  def instance_clusters_enabled?
-    Feature.enabled?(:instance_clusters, default_enabled: true)
-  end
-
   def find_kubernetes_service_integration
     services.deployment.reorder(nil).find_by(active: true)
   end

app/policies/clusters/instance_policy.rb

@@ -6,7 +6,7 @@ module Clusters
 
     condition(:has_clusters, scope: :subject) { clusterable_has_clusters? }
     condition(:can_have_multiple_clusters) { multiple_clusters_available? }
-    condition(:instance_clusters_enabled, scope: :subject) { @subject.instance_clusters_enabled? }
+    condition(:instance_clusters_enabled) { Instance.enabled? }
 
     rule { admin & instance_clusters_enabled }.policy do
       enable :read_cluster