[Blocked] Quiet PITest (mutation testing) output for local builds, but not for CI builds

[binkley]

Part of epic #599.
Waiting to hear on hcoles/pitest#1338 for quieting Maven.

Both the Gradle and Maven plugins for PITest have a verbose configuration option.
Spiking among the 4 cases (2 for Gradle/Maven; 2 for verbose true/false):

• Gradle plugin treats verbose true/false as regular build output
• Maven plugin treats verbose true/false as debug build output

Tasks

• Quiet Gradle regular build output in local use verbose is false as the default in build.gradle
• Show Gradle regular build output in CI -- CI needs a mechanism to set verbose to true; update build.gradle with a flag
• Quiet Maven regular build output in local -- see Refs below
• Show Maven regular build output in CI -- see Refs below
• Explore debug output

Refs

• Maven verbose option in configuration has no effect; looking for quieter builds hcoles/pitest#1338 - Maven PITest plugin issue discussing how to quiet regular output