Add summary table of failed constraints for Publisher log in expert mode

[tilln]

When there's more than just a few constraints, the Publisher log output in expert mode gets cluttered with successful constraint evaluation details.
An additional summary table makes the failing ones more obvious, for example:

Summary of failed constraints:
Report     Testcase   Metric     Operator                  Value Level
result.csv *          90% Line   not be greater than     10.000% Error
result.csv login      Average    not be greater than        3000 Warning    

[undera]

Thanks!