fix(java): run Maven in plain console-friendly mode (#1301)

Author: chanseokoh

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

@@ -47,15 +47,15 @@ set +e
 
 case ${JOB_TYPE} in
 test)
-    mvn test -B -Dclirr.skip=true -Denforcer.skip=true
+    mvn test -B -ntp -Dclirr.skip=true -Denforcer.skip=true
     RETURN_CODE=$?
     ;;
 lint)
-    mvn com.coveo:fmt-maven-plugin:check
+    mvn com.coveo:fmt-maven-plugin:check -B -ntp
     RETURN_CODE=$?
     ;;
 javadoc)
-    mvn javadoc:javadoc javadoc:test-javadoc
+    mvn javadoc:javadoc javadoc:test-javadoc -B -ntp
     RETURN_CODE=$?
     ;;
 integration)
@@ -104,7 +104,7 @@ samples)
     fi
     ;;
 clirr)
-    mvn -B -Denforcer.skip=true clirr:check
+    mvn -B -ntp -Denforcer.skip=true clirr:check
     RETURN_CODE=$?
     ;;
 *)