Compile JS before testing caching

That avoids flakiness.

spec/system/consumer/caching/shops_caching_spec.rb

@@ -14,9 +14,12 @@ describe "Shops caching", caching: true do
   }
 
   describe "caching enterprises AMS data" do
-    xit "caches data for all enterprises, with the provided options" do
-      pending "#11010"
+    it "caches data for all enterprises, with the provided options" do
+      # Trigger lengthy tasks like JS compilation before testing caching:
+      visit shops_path
+      Rails.cache.clear
 
+      # Now run the test, hopefully in a timely manner:
       visit shops_path
 
       key, options = CacheService::FragmentCaching.ams_shops