DEV: Check for pending migrations before running rspec suite

This should catch a few scenarios which can waste a lot of time in development
 - Forgetting to run migrations
 - Missing plugin migrations
 - Missing post_deploy migrations

spec/rails_helper.rb

@@ -176,6 +176,12 @@ RSpec.configure do |config|
   config.infer_base_class_for_anonymous_controllers = true
 
   config.before(:suite) do
+    begin
+      ActiveRecord::Migration.check_pending!
+    rescue ActiveRecord::PendingMigrationError
+      raise "There are pending migrations, run RAILS_ENV=test bin/rake db:migrate"
+    end
+
     Sidekiq.error_handlers.clear
 
     # Ugly, but needed until we have a user creator