docs(Summary Workflows): Logging

[ninsch3000]

Implement loggers in the scripts within the benchmarking dockers

• aggregation.py

• validation.py (especially: print the states of the individual checks to logfile, so if validation fails, user will have a first idea where to look for problems)

• compute_metrics.py

• merge_data_model_files.py: Logger present, but should be set from level "debugging" to "info"