Convenience metadata to stub gitlab.com

Ensure GitlabSubscription factory is only used under .com

ee/spec/factories/gitlab_subscriptions.rb

@@ -2,6 +2,10 @@
 
 FactoryBot.define do
   factory :gitlab_subscription do
+    after(:build) do
+      raise 'not under .com' unless Gitlab.com?
+    end
+
     namespace
     association :hosted_plan, factory: :ultimate_plan
     seats { 10 }

ee/spec/factories/groups.rb

@@ -73,7 +73,7 @@ FactoryBot.define do
 
   factory :group_with_plan, parent: :group do
     transient do
-      plan { :default_plan }
+      plan { :free_plan }
       trial_ends_on { nil }
     end
 

ee/spec/factories/namespaces.rb

@@ -47,7 +47,7 @@ end
 FactoryBot.define do
   factory :namespace_with_plan, parent: :namespace do
     transient do
-      plan { :default_plan }
+      plan { :free_plan }
       trial_ends_on { nil }
     end