Convenience metadata to stub SaaS/gitlab.com

Works with let_it_be which is done before_all,
where method stubbing is not allowed.

ee/spec/support/stub_dot_com_check.rb

+# frozen_string_literal: true
+
+RSpec.configure do |config|
+  config.before(:context, :saas) do
+    # Ensure Gitlab.com? returns true during context.
+    # This is needed for let_it_be which is shared across examples,
+    # therefore the value must be changed in before_all,
+    # but RSpec prevent stubbing method calls in before_all,
+    # therefore we have to resort to temporarily swap url value.
+    @_original_gitlab_url = Gitlab.config.gitlab['url']
+    Gitlab.config.gitlab['url'] = Gitlab::Saas.com_url
+  end
+  config.after(:context, :saas) do
+    # Swap back original value
+    Gitlab.config.gitlab['url'] = @_original_gitlab_url
+  end
+end