Update ECAL training sample configuration

@gcorti @kreps @adavis

This MR is an update of the configuration needed to produce a training sample for ECAL (first introduced here) with the following changes

1. Remove the monitoring algorithm as it is in fact a tuple writer and is no longer needed if we want just the sim file to be produced.

2. I was only able to add EcalCollector hits to GaussTape with appendPostConfigAction. I have tested this by trying to list the contents of /Event/MC/EcalCollector in Boole using the sim file produced with this configuration. The reason why this only works with appendPostConfigAction is because the ItemList property is flushed in SimConf (see here). We can either go with this or change Gauss/LHCb configuration, but this needs a release unless there is some other smarter way of doing this.