Add ci rule for blocking legacy kernel registration (#45982)

* add ci rule for blocking legacy kernel registration, test=document_fix

* add a test case, test=document_fix

* Revert "add a test case, test=document_fix"

This reverts commit 239e08678b791aabb8fae48c4b74f2a8861e222d.

* polish desc, test=document_fix

tools/check_file_diff_approvals.sh

@@ -213,6 +213,13 @@ if [ ${NO_INFRT_FILES} ] && [ ${HAS_LOG_FATAL} ] && [ "${GIT_PR_ID}" != "" ]; th
     check_approval 1 6836917 47554610 22561442
 fi
 
+FILTER=`git diff --name-only upstream/develop | grep -v "tools/"`
+HAS_LEGACY_KERNEL_REGISTRATION=`git diff -U0 upstream/$BRANCH $FILTER | grep '^\+' | grep -oE -m 1 "REGISTER_OP[A-Z_]{1,9}KERNEL[_FUNCTOR|_WITH_CUSTOM_TYPE|_EX]*" || true`
+if [ ${HAS_LEGACY_KERNEL_REGISTRATION} ] && [ "${GIT_PR_ID}" != "" ]; then
+    echo_line="In principle, adding an OpKernel needs to be in the phi/kernels directory. If you must add an OpKernel in the fluid/operators directory, please request one of the RD (chenwhql, zyfncg, YuanRisheng, phlrain) review and approve.\n"
+    check_approval 1 chenwhql zyfncg YuanRisheng phlrain
+fi
+
 HAS_DEFINE_FLAG=`git diff -U0 upstream/$BRANCH |grep -o -m 1 "DEFINE_int32" |grep -o -m 1 "DEFINE_bool" | grep -o -m 1 "DEFINE_string" || true`
 if [ ${HAS_DEFINE_FLAG} ] && [ "${GIT_PR_ID}" != "" ]; then
     echo_line="You must have one RD lanxianghit approval for the usage (either add or delete) of DEFINE_int32/DEFINE_bool/DEFINE_string flag.\n"