chore: minimize noise from build scripts (#1091)

This should limit the amount of scrolling client devs have to do when debugging a test failure

Co-authored-by: Elliotte Rusty Harold <elharo@users.noreply.github.com>
Co-authored-by: Neenu Shaji <Neenu1995@users.noreply.github.com>

synthtool/gcp/templates/java_library/.kokoro/coerce_logs.sh

@@ -28,7 +28,6 @@ job=$(basename ${KOKORO_JOB_NAME})
 echo "coercing sponge logs..."
 for xml in `find . -name *-sponge_log.xml`
 do
-  echo "processing ${xml}"
   class=$(basename ${xml} | cut -d- -f2)
   dir=$(dirname ${xml})/${job}/${class}
   text=$(dirname ${xml})/${class}-sponge_log.txt