Use `check_<feature>_available!` to trigger method missing

Similar to how we check project features.

app/controllers/ee/groups/application_controller.rb

@@ -7,7 +7,7 @@ module EE
 
       def method_missing(method_sym, *arguments, &block)
         case method_sym.to_s
-        when /\Acheck_group_(.*)_available!\z/
+        when /\Acheck_(.*)_available!\z/
           check_group_feature_available!($1.to_sym)
         else
           super

app/controllers/groups/analytics_controller.rb

 class Groups::AnalyticsController < Groups::ApplicationController
   before_action :group
-  before_action :check_group_contribution_analytics_available!
+  before_action :check_contribution_analytics_available!
 
   layout 'group'