lint: catch NOMERGE comments (#33820)

* nomerge

* Update modeld.py

scripts/lint/check_nomerge_comments.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+FAIL=0
+
+if grep -n '\(#\|//\)\([[:space:]]*\)NOMERGE' $@; then
+  echo -e "NOMERGE comments found! Remove them before merging\n"
+  FAIL=1
+fi
+
+exit $FAIL

scripts/lint/lint.sh

@@ -52,6 +52,7 @@ function run_tests() {
   run "check_added_large_files" python3 -m pre_commit_hooks.check_added_large_files --enforce-all $ALL_FILES --maxkb=120
   run "check_shebang_scripts_are_executable" python3 -m pre_commit_hooks.check_shebang_scripts_are_executable $ALL_FILES
   run "check_shebang_format" $DIR/check_shebang_format.sh $ALL_FILES
+  run "check_nomerge_comments" $DIR/check_nomerge_comments.sh $ALL_FILES
 
   if [[ -z "$FAST" ]]; then
     run "mypy" mypy $PYTHON_FILES