Removed ReviewAppSetup file

Got rid off unnecessary refactoring.

app/controllers/concerns/review_app_setup.rb

-# frozen_string_literal: true
-
-module ReviewAppSetup
-  include Gitlab::Utils::StrongMemoize
-  include ChecksCollaboration
-
-  def can_setup_review_app?
-    strong_memoize(:can_setup_review_app?) do
-      cicd_missing? || (can_cluster_be_created? && cluster_missing?)
-    end
-  end
-
-  def cicd_missing?
-    current_user && can_current_user_push_code? && project.repository.gitlab_ci_yml.blank? && !project.auto_devops_enabled?
-  end
-
-  def can_cluster_be_created?
-    current_user && can?(current_user, :create_cluster, project)
-  end
-
-  def can_current_user_push_code?
-    strong_memoize(:can_current_user_push_code) do
-      if project.empty_repo?
-        can?(current_user, :push_code, project)
-      else
-        can_current_user_push_to_branch?(project.default_branch)
-      end
-    end
-  end
-
-  def cluster_missing?
-    strong_memoize(:cluster_missing?) do
-      project.clusters.blank?
-    end
-  end
-
-  def can_current_user_push_to_branch?(branch)
-    user_access(project).can_push_to_branch?(branch)
-  end
-end

app/presenters/project_presenter.rb

@@ -8,7 +8,7 @@ class ProjectPresenter < Gitlab::View::Presenter::Delegated
   include TreeHelper
   include IconsHelper
   include ChecksCollaboration
-  include ReviewAppSetup
+  include Gitlab::Utils::StrongMemoize
 
   presents :project
 
@@ -124,6 +124,20 @@ class ProjectPresenter < Gitlab::View::Presenter::Delegated
     license&.nickname || license&.name || 'LICENSE'
   end
 
+  def can_current_user_push_code?
+    strong_memoize(:can_current_user_push_code) do
+      if empty_repo?
+        can?(current_user, :push_code, project)
+      else
+        can_current_user_push_to_branch?(default_branch)
+      end
+    end
+  end
+
+  def can_current_user_push_to_branch?(branch)
+    user_access(project).can_push_to_branch?(branch)
+  end
+
   def can_current_user_push_to_default_branch?
     can_current_user_push_to_branch?(default_branch)
   end
@@ -263,7 +277,7 @@ class ProjectPresenter < Gitlab::View::Presenter::Delegated
 
   def kubernetes_cluster_anchor_data
     if can_cluster_be_created?
-      if clusters.empty?
+      if clusters_empty?
         AnchorData.new(false,
                        statistic_icon + _('Add Kubernetes cluster'),
                        new_project_cluster_path(project))
@@ -311,6 +325,26 @@ class ProjectPresenter < Gitlab::View::Presenter::Delegated
     count_of_extra_topics_not_shown > 0
   end
 
+  def can_setup_review_app?
+    strong_memoize(:can_setup_review_app) do
+      cicd_missing? || (can_cluster_be_created? && clusters_empty?)
+    end
+  end
+
+  def can_cluster_be_created?
+    current_user && can?(current_user, :create_cluster, project)
+  end
+
+  def cicd_missing?
+    current_user && can_current_user_push_code? && repository.gitlab_ci_yml.blank? && !auto_devops_enabled?
+  end
+
+  def clusters_empty?
+    strong_memoize(:cluster_missing) do
+      project.clusters.empty?
+    end
+  end
+
   private
 
   def filename_path(filename)

app/serializers/review_app_setup_entity.rb

@@ -2,15 +2,14 @@
 
 class ReviewAppSetupEntity < Grape::Entity
   include RequestAwareEntity
-  include ReviewAppSetup
 
   expose :can_setup_review_app?
 
-  expose :cluster_missing?, if: -> (_, _) { can_setup_review_app? } do |project|
-    cluster_missing?
+  expose :clusters_empty?, if: -> (_, _) { project.can_setup_review_app? } do |project|
+    project.clusters_empty?
   end
 
-  expose :review_snippet, if: -> (_, _) { can_setup_review_app? } do |_|
+  expose :review_snippet, if: -> (_, _) { project.can_setup_review_app? } do |_|
     YAML.safe_load(File.read(Rails.root.join('lib', 'gitlab', 'ci', 'snippets', 'review_app_default.yml'))).inspect
   end