Merge branch 'update_feature_category_for_experimentation_expansion' into 'master'

Update feature category for experimentation expansion

See merge request gitlab-org/gitlab!60816

ee/lib/api/experiments.rb

@@ -4,7 +4,7 @@ module API
   class Experiments < ::API::Base
     before { authorize_read_experiments! }
 
-    feature_category :product_analytics
+    feature_category :experimentation_expansion
 
     resource :experiments do
       desc 'Get a list of all experiments' do