Onboarding redirect tests and trial status bar (#2197)

* Onboarding redirect tests and trial status bar

* use helper method

* Fix time tolerance failure

* Update post-onboarding message to be generic

* Disable turbo frames on Trial start button

* Update flash notice in test

app/models/user.rb

@@ -152,6 +152,10 @@ class User < ApplicationRecord
     totp.provisioning_uri(email)
   end
 
+  def onboarded?
+    onboarded_at.present?
+  end
+
   private
     def ensure_valid_profile_image
       return unless profile_image.attached?