Refactor metrics_dashboard response conditionals

app/controllers/projects/environments_controller.rb

@@ -159,12 +159,13 @@ class Projects::EnvironmentsController < Projects::ApplicationController
 
   def metrics_dashboard
     render_403 && return unless Feature.enabled?(:environment_metrics_use_prometheus_endpoint, @project)
+    result = Gitlab::MetricsDashboard::Service.new(@project, @current_user, environment: environment).get_dashboard
 
     respond_to do |format|
-      format.json do
-        result = Gitlab::MetricsDashboard::Service.new(@project, @current_user, environment: environment).get_dashboard
-
-        render_metrics_dashboard_response(result)
+      if result[:status] == :success
+        format.json { render status: :ok, json: result  }
+      else
+        format.json { render status: result[:http_status], json: result }
       end
     end
   end
@@ -209,13 +210,6 @@ class Projects::EnvironmentsController < Projects::ApplicationController
     params.require([:start, :end])
   end
 
-  def render_metrics_dashboard_response(result)
-    ok_status = :ok if result[:status] == :success
-    status = ok_status || result[:http_status] || :bad_request
-
-    render status: status, json: result
-  end
-
   def search_environment_names
     return [] unless params[:query]