test: remove outdated V8 flag
The flag is going to be removed upstream in V8 9.0.
Refs: https://github.com/v8/v8/commit/0a480c30d553c1b8dddb0dddcbdec5fb6f3101ff
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
The flag is going to be removed upstream in V8 9.0.
Refs: https://github.com/v8/v8/commit/0a480c30d553c1b8dddb0dddcbdec5fb6f3101ff