[CodeStyle] fix renamed files not being monitored by Codestyle Check (#48892)

tools/codestyle/pre_commit.sh

@@ -29,7 +29,7 @@ if ! [[ $(python -V 2>&1 | awk '{print $2}' | awk -F '.' '{print $1$2}') -ge 36
     exit 1
 fi
 
-diff_files=$(git diff --numstat ${BRANCH} | awk '{print $NF}')
+diff_files=$(git diff --name-only --diff-filter=ACMR ${BRANCH})
 num_diff_files=$(echo "$diff_files" | wc -l)
 echo -e "diff files between pr and ${BRANCH}:\n${diff_files}"