chore: Unset the tool options

Author: lqiu96

.kokoro/build.sh

@@ -77,10 +77,11 @@ integration)
     RETURN_CODE=$?
     ;;
 graalvm)
+    unset JAVA_TOOL_OPTIONS
     # Run Unit and Integration Tests with Native Image
     bash .kokoro/populate-secrets.sh
     export GOOGLE_APPLICATION_CREDENTIALS="${KOKORO_GFILE_DIR}/secret_manager/java-it-service-account"
-    mvn -B ${INTEGRATION_TEST_ARGS} -ntp -Pnative -Pnative-test -Pslf4j2x test -pl 'oauth2_http' -Dnative.image.args="-Djavax.net.debug=all"
+    mvn -B ${INTEGRATION_TEST_ARGS} -ntp -Pnative -Pnative-test -Pslf4j2x test -pl 'oauth2_http'
     RETURN_CODE=$?
     ;;
 samples)