Fix flacky spec

Wait for labels to load before clicking the label.

ee/spec/features/groups/iterations/user_views_iteration_spec.rb

@@ -86,6 +86,7 @@ RSpec.describe 'User views iteration' do
         sign_in(user)
 
         visit group_iteration_path(iteration.group, iteration.id)
+        wait_for_requests
       end
 
       it_behaves_like 'iteration report group by label'

ee/spec/features/projects/iterations/user_views_iteration_spec.rb

@@ -59,6 +59,7 @@ RSpec.describe 'User views iteration' do
       stub_licensed_features(iterations: true)
       sign_in(user)
       visit url
+      wait_for_requests
     end
 
     it_behaves_like 'render iteration page'