Enable tracing, but leave sampling at zero

Author: Jean85

tests/End2End/App/config.yml

@@ -1,7 +1,10 @@
 sentry:
+  tracing:
+    enabled: true
   options:
     capture_silenced_errors: true
     error_types: E_ALL & ~E_USER_DEPRECATED
+    traces_sample_rate: 0
 
 framework:
   router: { resource: "%routing_config_dir%/routing.yml" }