Use the changed_files output which respects the files-ignore filter

Author: yufengwangca

.github/workflows/build.yaml

@@ -215,11 +215,12 @@ jobs:
                 # Exclude all files under "third_party/"
                 files-ignore: |
                   third_party/
+
             - name: Clang-tidy validation
               # NOTE: clang-tidy crashes on CodegenDataModel_Write due to Nullable/std::optional check.
               #       See https://github.com/llvm/llvm-project/issues/97426
               env:
-                  ALL_CHANGED_FILES: ${{ steps.changed-files.outputs.all_changed_files }}
+                  ALL_CHANGED_FILES: ${{ steps.changed-files.outputs.changed_files }}
               run: |
                   touch out/changed_files.txt
                   for file in ${ALL_CHANGED_FILES}; do