Create ClustersFinder

app/finders/clusters_finder.rb

+class ClustersFinder
+  def initialize(project, user, scope)
+    @project = project
+    @user = user
+    @scope = scope
+  end
+
+  def execute
+    clusters = case @scope
+               when :all
+                 project.clusters
+               when :disabled
+                 project.clusters.enabled
+               when :enabled
+                 project.clusters.disabled
+               end
+    clusters.map { |cluster| cluster.present(current_user: @user) }
+  end
+end