Create validated.json keeping only samples that passed validation process

[Shettland]

This would be a nice enhancement for json_validation.py, as it only creates an excel file with the invalid samples (in order to send it to the researcher), but it does not output which samples have been validated.

Therefore, it would be nice if it created a copy of the processed json, keeping only the samples that were successfully validated.

It would also be quite helpful if the prompted summary showed the number of samples successfully validated and/or the total of samples that were processed, instead of just the ones that failed the validation process.