approval for skip_check_grad_ci is required, test=develop (#21854)

tools/check_api_approvals.sh

@@ -198,6 +198,22 @@ if [ "${NEW_OP_TEST_ADDED}" != "" ] && [ "${GIT_PR_ID}" != "" ]; then
     fi
 fi
 
+UNITTEST_FILE_CHANGED=`git diff --name-only --diff-filter=AM upstream/$BRANCH |grep -E "test_.*.\.py" || true`
+if [ "${UNITTEST_FILE_CHANGED}" != "" ] && [ "${GIT_PR_ID}" != "" ]; then
+    for TEST_FILE in ${UNITTEST_FILE_CHANGED};
+    do
+        HAS_SKIP_CHECK_GRAD_CI=`git diff -U0 upstream/$BRANCH ${PADDLE_ROOT}/${TEST_FILE} |grep "@skip_check_grad_ci" || true`
+        if [ "${HAS_SKIP_CHECK_GRAD_CI}" != "" ]; then
+            ERROR_LINES="${ERROR_LINES}\n${TEST_FILE}\n${HAS_SKIP_CHECK_GRAD_CI}\n"
+        fi
+    done
+    if [ "${ERROR_LINES}" != "" ]; then
+        ERROR_LINES=${ERROR_LINES//+/'\n+\t'}
+        echo_line="You must have one RD (zhangting2020 (Recommend), luotao1 or phlrain) approval for the usage (either add or delete) of @skip_check_grad_ci. For more information, please refer to: https://github.com/PaddlePaddle/Paddle/wiki/Gradient-Check-Is-Required-for-Op-Test. The corresponding lines are as follows:\n${ERROR_LINES}\n"
+        check_approval 1 26615455 6836917 43953930
+    fi
+fi
+
 if [ -n "${echo_list}" ];then
   echo "****************"
   echo -e "${echo_list[@]}"