Apply suggestions from code review

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: chingor13

.kokoro/build.sh

@@ -43,9 +43,9 @@ case ${JOB_TYPE} in
       install_modules "${BUILD_SUBDIR}"
       echo "Running in subdir: ${BUILD_SUBDIR}"
       pushd "${BUILD_SUBDIR}"
-      EXTRA_PROFILE_OPT=""
+      EXTRA_PROFILE_OPTS=()
     else
-      EXTRA_PROFILE_OPT="-PbulkTests"
+      EXTRA_PROFILE_OPTS=("-PbulkTests")
     fi
     echo "SUREFIRE_JVM_OPT: ${SUREFIRE_JVM_OPT}"
     retry_with_backoff 3 10 \
@@ -59,7 +59,7 @@ case ${JOB_TYPE} in
         -Dflatten.skip=true \
         -Danimal.sniffer.skip=true \
         -Dmaven.wagon.http.retryHandler.count=5 \
-        -T 1C ${SUREFIRE_JVM_OPT} ${EXTRA_PROFILE_OPT}
+        -T 1C ${SUREFIRE_JVM_OPT} "${EXTRA_PROFILE_OPTS[@]}"
     RETURN_CODE=$?
 
     if [[ -n "${BUILD_SUBDIR}" ]]