Revert "remove wfe ntx and interval. Nighlies should fail."

This reverts commit 444747c7.

CI runs perfectly with 10 workflow threads and a
"check for work" interval of 1 second.

continuousintegration/docker/ctafrontend/cc7/opt/run/bin/ctaeos-mgm.sh

@@ -197,9 +197,9 @@ fi
   # enable eos workflow engine
   eos space config default space.wfe=on
   # set the thread-pool size of concurrently running workflows
-  #eos space config default space.wfe.ntx=10
+  eos space config default space.wfe.ntx=10
   # set interval in which the WFE engine is running
-  #eos space config default space.wfe.interval=1
+  eos space config default space.wfe.interval=1
 
 # configure preprod directory separately
 /opt/run/bin/eos_configure_preprod.sh