Merge branch 'zj-perf-bar-default-dev' into 'master'

Enable the performance bar in dev environments

Closes #40989

See merge request gitlab-org/gitlab-ce!15913

app/controllers/concerns/with_performance_bar.rb

@@ -6,6 +6,7 @@ module WithPerformanceBar
   end
 
   def peek_enabled?
+    return true if Rails.env.development?
     return false unless Gitlab::PerformanceBar.enabled?(current_user)
 
     if RequestStore.active?