Re-arrange deployment_platform to avoid cop complainments

app/models/concerns/deployment_platform.rb

 module DeploymentPlatform
   # EE would override this and utilize environment argument
+  # rubocop:disable Gitlab/ModuleWithInstanceVariables
   def deployment_platform(environment: nil)
     @deployment_platform ||= {}
-    @deployment_platform[environment] ||= begin
-      find_cluster_platform_kubernetes(environment: environment) ||
+
+    @deployment_platform[environment] ||= find_deployment_platform(environment)
+  end
+
+  private
+
+  def find_deployment_platform(environment)
+    find_cluster_platform_kubernetes(environment: environment) ||
       find_kubernetes_service_integration ||
       build_cluster_and_deployment_platform
-    end
   end
 
   # EE would override this and utilize environment argument
@@ -15,8 +21,6 @@ module DeploymentPlatform
       .last&.platform_kubernetes
   end
 
-  private
-
   def find_kubernetes_service_integration
     services.deployment.reorder(nil).find_by(active: true)
   end