FEATURE: Promote the "delete group" staff action log. (#16656)

We used to log group deletion as custom, which means we can't later search for them. Include group ID in the details.

spec/requests/admin/groups_controller_spec.rb

@@ -274,6 +274,7 @@ RSpec.describe Admin::GroupsController do
 
       expect(history).to be_present
       expect(history.details).to include("name: #{group.name}")
+      expect(history.details).to include("id: #{group.id}")
     end
 
     it 'logs the grant_trust_level attribute' do