Don't run perf bar test in live envs

qa/qa/specs/features/browser_ui/non_devops/performance_bar_spec.rb

@@ -2,7 +2,7 @@
 
 module QA
   RSpec.describe 'Non-devops' do
-    describe 'Performance bar display', :requires_admin do
+    describe 'Performance bar display', :requires_admin, :skip_live_env do
       context 'when logged in as an admin user' do
         # performance metrics: pg, gitaly, redis, rugged (feature flagged), total (not always provided)
         let(:minimum_metrics_count) { 3 }