Add config toggle for turning off Verbose JVM GC output

[nicknezis]

Is your feature request related to a problem? Please describe.
The current implementation will generate 5 x 100MB x # of components worth of log files with JVM GC debug output. This is in addition to the actual log files (5 x 100MB x # of components)

Describe the solution you'd like
I would like a simple toggle to enable/disable this GC debug output

Describe alternatives you've considered
We could also make the log configuration parameters configurable, but I would be happy enough with ability to toggle.

Additional context
The Heron executor also seems to have older JVM parameters (pre-JDK 9), but we are now on JDK 11, so I think we should also clean up the older code that is no longer needed.

[nicknezis]

Resolved by #3663