LogbackLoggingSystem does not report suppressed exception details

[philwebb]

LogbackLoggingSystem.reportConfigurationErrorsIfNecessary currently reports errors but does not include all stacktrace details. We should pull them from the Status when we can and add them as suppressed exceptions .

[robozb]

Dear @philwebb, Thank you so much, you are great!

[wilkinsona]

Closed by 694ff4f.