[v8.x] src: fix fs.write() externalized string handling
Backport https://github.com/nodejs/node/pull/18216
The merge conflicts in node_file.cc were non-trivial, so the changes there deserve to be treated like original content during review.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Backport https://github.com/nodejs/node/pull/18216
The merge conflicts in node_file.cc were non-trivial, so the changes there deserve to be treated like original content during review.